Malicious PDF — malware analysis report

Static analysis result for SHA-256 7130a229ed83e100…

MALICIOUS

PDF

100.0 KB Created: 2021-05-31 06:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99260f09f261da02e5aa937e9ae60d11 SHA-1: 69c9f8fbe24eb4839da0e6d1bbd413c3533c5c30 SHA-256: 7130a229ed83e100a9c06e2fbff3636a62f48d0ac0768cd19f1e4801cc5371e7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=cuestionario+de+geografia+quinto+grado+bloque+4+montenegro PDF link annotation
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/2852244.pdfIn PDF document text
    • https://wemotodatuvuxog.weebly.com/uploads/1/3/2/6/132681969/tagupun.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374366/normal_60b252ea71e23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fed5772e4421.pdfIn PDF document text
    • https://tadarumoroje.weebly.com/uploads/1/3/4/7/134724086/9814636.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/zusaf-loliw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_60288d74b9006.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/gedazikazubejizaxer.pdfIn PDF document text
    • https://mafizawejibon.weebly.com/uploads/1/3/1/3/131383772/dajajirituka-xelawirojadi-nowix-fatibelefojox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_604a6747b47e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_6014bd502cd9c.pdfIn PDF document text
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/3702068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_602bdcb68591c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4423eaf4-9e4b-4462-9122-452fde0e98ad/what_happens_to_my_texas_trs_if_i_quit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1444eab-c4c5-494f-bb1b-c29b9faffa1c/1_peter_4_bible_study_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec398b3a-9025-4aea-89a3-6db0e11ce3e2/5904136047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c230d612-a722-410a-ad31-ba8c9766cd90/82810342430.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 5488 bytes
SHA-256: 241cf46415bab3916d5a761f1e20f2171e24af89a3a4aea771bc1eb55f37d309
font_02_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_03_sfnt_off00014064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14064 13396 bytes
SHA-256: e14a0dfe8a48847c113ca952f7348d1079bc4e88d056efee3550942d17bdc358
font_04_sfnt_off00016a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A72 16164 bytes
SHA-256: 731768d427d4e765fcf06156833c7a8b33611a9f9c7c28c95afcc3719f046f5d

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