Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a0787451ad0548…

MALICIOUS

PDF

71.1 KB Created: 2021-01-13 17:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dc87ce300ff00ee9976dc4ed4af38571 SHA-1: 14a53ad435b7ad0adcd3cc507e748dc2f7ef1428 SHA-256: 44a0787451ad05487d58ed1fa39e322cf73e74d3736aca0fb4fa810b5c1b1e16
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirector document. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure related to search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=codingbat+recursion+1+answers+array6 In PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/pesipabuko.pdfIn PDF document text
    • https://lugivizukur.weebly.com/uploads/1/3/1/8/131871894/sugixujuranat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_5fb6734cb9bff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500897/normal_5fdd168b7b8e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/jhfhbf9/wawukilenixipuraxugoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fa405e0bd850.pdfIn PDF document text
    • https://benepota.weebly.com/uploads/1/3/5/3/135322084/jovaka_mizugiwefonulal_vaxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5f9f9e93e7450.pdfIn PDF document text
    • https://fafexozoruxefok.weebly.com/uploads/1/3/4/5/134527426/kopunojos_wesukoburipoz_nafekuweserepog_riduvuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5ffadc2ba87af.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/dusubonifu/90618503116.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/comment_runir_plusieurs_en_un_seul_document.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/work_and_energy_worksheet_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 5520 bytes
SHA-256: 209b48cf3451437e4263a96e8b2d3a45687a1e061388e18e56cd2e99e3500378
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 11160 bytes
SHA-256: 04532c6e3a9fda375a439779e615f5a1ad0071ae28d9e7c7e8dedec22615bc57

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