Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08fb23d5d23ef2a…

MALICIOUS

PDF

98.0 KB Created: 2021-04-02 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f191d995b611f60d7e2f4f754aca4085 SHA-1: 5fe6c5411da005ac20156ea774704b46d100d676 SHA-256: b08fb23d5d23ef2a9669018f88884beedc8fbbace1cd90f4049b360b7323bc4c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=biasing+of+transistor+pdf PDF link annotation
    • https://naxufagu.weebly.com/uploads/1/3/4/7/134713872/wakavoferorul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_6048162bd8619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_6017be6a3add1.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/afa824ced10.pdfIn PDF document text
    • https://sakiverore.weebly.com/uploads/1/3/6/0/136095660/finobujarokile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fe81a7936c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5fc710f4bf5b0.pdfIn PDF document text
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/jeraruv.pdfIn PDF document text
    • https://vutadatibanol.weebly.com/uploads/1/3/4/8/134883393/880549.pdfIn PDF document text
    • https://zefipoxiba.weebly.com/uploads/1/3/2/6/132681281/0ec8ebeed87be08.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/linoranutikof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_6007c7c1e051a.pdfIn PDF document text
    • http://bowabemolova.22web.org/summa_theologica_latin.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/7104432.pdfIn PDF document text
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/rotopoxobexigatim.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/508292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_5183cfb3e5e449269767df7b83b473f7.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_0a11c7918a0b45d0a4af1cc0f4953640.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_07bfa03ae83c4480a47fe40e62ab5e30.pdf?index=trueIn PDF document text
    • http://bageradafasuk.rf.gd/gajowutudavonogel.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_9cf95f3b8ff34221bb832cb639fb2ceb.pdf?index=trueIn PDF document text
    • http://difiravopaju.epizy.com/shooting_an_elephant_questions.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_ce2ff353e34f4f47a1dce188b4426003.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_261dd4286e0a4c8ca0244c07d0ac46d2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 5224 bytes
SHA-256: 3f68a1bf8ce0678f92d3169bf37b356bb2e774b70b04deaf9e1e6a57c993a854
font_01_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 6300 bytes
SHA-256: fecdc1be9fbca5edf5f71ffa26a665fc07b69ef0d92ce07c3236febf95bc503b
font_02_sfnt_off00013af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF6 12288 bytes
SHA-256: b2cd64ddce267a8426dd4544749f09a19c1f4bb4fc092f9e3859ec1f3e6c3407
font_03_sfnt_off000164ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EE 16100 bytes
SHA-256: 513236b56cd24d18f1916a542380e1656fe596eca6e14df5516133ff488da9f9

Open this report in the interactive analyzer, or submit your own file for analysis.