Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51bb13f2b0291eb…

MALICIOUS

PDF

89.1 KB Created: 2021-03-20 03:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 35fd9c394f7bf5cd2aae86faf987678c SHA-1: 10d3218edf5f4ae475aa7c5bc7f85edb117200c4 SHA-256: a51bb13f2b0291eb7c6639fe88e608467b0ee0737ace810cb92cd232820715b0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=breakfast+at+tiffany+s+novel+pdf PDF link annotation
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/a24b21a85c.pdfIn PDF document text
    • https://dovilukimiju.weebly.com/uploads/1/3/0/7/130776072/nazerim.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/tjhzNgd/momigigutuvew.pdfIn PDF document text
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/3da2423d.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/7a254a7.pdfIn PDF document text
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/3f84bf.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/AW0gdih/87921288222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votoromuw.epizy.com/jotul_f_602_manual.pdfIn PDF document text
    • http://rumalitufe.rf.gd/select2_bootstrap_example.pdfIn PDF document text
    • http://fabibobitobabo.epizy.com/juzavemujezudoxezofavilan.pdfIn PDF document text
    • http://maxuxezobaromov.epizy.com/hatinggabi_impressionism_or_expressionism_brainly.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_ddc1d2ea9f2f44cd828e2dc7c511d4d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/24857332661.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_77f031b50c6d4dd79e760e11e085af4d.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_75b3ab3442cb4e0ab2073cf09bba6542.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_d31aa47123854cef9df3eb63a8bcefea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/mulevuv.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_0d7fddfdd959493484b6a6b4f4780844.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_53fb3f207a30423a96ff125e030ca4fb.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_2789af0ea97b468b8810134fcd3eaa2b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 5312 bytes
SHA-256: 7456540d4c1b41a9a8e8e6dc2fce2a98f375fdf8c593b57f06bb651475060555
font_01_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 12072 bytes
SHA-256: 42ac095ac51c61565768850cebb63bc59b73b026f9ad46b8f0f46d73d564825d

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