Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc62501de58734e…

MALICIOUS

PDF

75.5 KB Created: 2021-02-22 14:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b9956283a243f647092e092dfe8a8f1 SHA-1: d12176e3a232fe21a7e1a1da9ccd17379039a573 SHA-256: 7dc62501de58734e4f762233877f7353ef4031e475ab269008307c39a5ac9d84
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 of which point to disposable domains or link farms, suggesting a SEO scam or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to further compromise.

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://jottigo.ru/123?utm_term=moon+river+chords+for+guitar PDF link annotation
    • http://snt-br.ru/6463162426z7aqo.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/d3b1d92f1f.pdfIn PDF document text
    • http://jakor.pro/xijakipigeb21ek2.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/himihj3/85631458801.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/kakefipi-denoteru-bomomazofadadu.pdfIn PDF document text
    • http://hisgohar.site/6013390900zfvg8.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/hhfDAje/kokabixaxazeli.pdfIn PDF document text
    • https://patosalar.weebly.com/uploads/1/3/1/3/131384166/jajabagisiz_jegulezunojo_xaxibuzev.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/ibI1rtr/desasaluvufege.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/english_for_dummies_spanish8g6jt.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/labiwun-jadem.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/hajhFC4/65380699321.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/3217579.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ijEWjir/63045344952.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gepuwuvezu.epizy.com/17304920914.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/xonigalakorufisejafuruj.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 5316 bytes
SHA-256: aa7e3edf84dbdc9dc98e4d01b7c7ff8319af5f292a9f50863e4125b1e66f0096
font_01_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11188 bytes
SHA-256: aaab8cd591b2a35feb65459ec08bac0fb2c1caa1680b18ce58316efbb0cf2a14
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 16084 bytes
SHA-256: 096dc22bd3c9caec6309818842dfa19dd0da92d8ef7919229ff7edf1d3f8df14

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