Malicious PDF — malware analysis report

Static analysis result for SHA-256 1078df23a22904dc…

MALICIOUS

PDF

98.4 KB Created: 2021-05-18 13:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c7ceacc2f667e353761f894cd861c3e SHA-1: 276750d54cecf03de88a9feaebe988c13cf23065 SHA-256: 1078df23a22904dc9b987a971b180286d0a99b191d9153a5cfbf4d14fe4bd7a5
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=best+research+topics+in+physical+chemistry PDF link annotation
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/wokinup.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/bivewevikagesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_60673ca373790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_601bdf296b63c.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/telufowonal-jitobuzijesazit-lifagorolaz-burudek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_602835ab60461.pdfIn PDF document text
    • https://gijamaxo.weebly.com/uploads/1/3/0/7/130740113/5aa5259477a58.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/minefevabigoxa.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/4149448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_600575c2b3dca.pdfIn PDF document text
    • http://mimiluzaxapurum.22web.org/lotemaroparulesirisol.pdfIn PDF document text
    • http://ranomurivokav.22web.org/loraine_boettner_roman_catholicism.pdfIn PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/550daf70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_6026aa3d0698b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befarekogol/vorisokovoxorukafafav.pdfIn PDF document text
    • http://lazevemu.epizy.com/importancia_del_bienestar_psicologico.pdfIn PDF document text
    • http://latuwukatagowa.epizy.com/utopia_origin_guide_food.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/15038942088.pdfIn PDF document text
    • http://wivonuwexewixir.rf.gd/50435168259.pdfIn 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
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 5324 bytes
SHA-256: 4871a6681e6c953d18b007da130ab90f1b6913c2b24a4eedf17e669c7a54d71f
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 3824 bytes
SHA-256: 7d90687dae2bd230987c475cd3c70aa5cf5de802e2b56bc1dffa0beb8fdc3253
font_03_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10604 bytes
SHA-256: 3e3bf695996857d0e860c0041c1748371f0933e26b3abc5d728dd797d2d32bb4
font_04_sfnt_off00015956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15956 16932 bytes
SHA-256: 36c5a1445ffc65708d380a1659b1a101965b0a158483348d7b3f6a371f4245f6
font_05_sfnt_off00017188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17188 1752 bytes
SHA-256: 3370fd1329872e14f87eaf29bf8ccad2abefae3508a3ff62a6e7dc0562995f5c

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