Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c548620d8f80a8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-01 12:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e908a82c59f113464190e71310680991 SHA-1: 98f1ad3403755f9cdcddb38c775f2d1f73d69925 SHA-256: 78c548620d8f80a8da3b08164a53fdcf368d79611ff81aed747453fb3feaffa7
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure to external malicious sites.

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
  • 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.
  • 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://botokaw.ru/award?keyword=elephant+man+real+name+jamaica PDF link annotation
    • http://siwosupegejolop.medianewsonline.com/is_there_a_pge_outage_in_my_area.pdfIn PDF document text
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/xogiputov-sumetimenogiti.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/if1giiT/gajalusibenaxugoj.pdfIn PDF document text
    • https://nivebisela.weebly.com/uploads/1/3/3/9/133997547/9005400.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/ggTidia/paint_by_numbers_customer_service.pdfIn PDF document text
    • https://sezosuxinowa.weebly.com/uploads/1/3/4/2/134266263/vixonezixaxax_lenekisoj_zebatebowoz.pdfIn PDF document text
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/5d89fddb04754b.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/pghigjh/pasevufufenem.pdfIn PDF document text
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/firezufazer_liropupefi.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/1070bd.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/2170518.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/naxizugenabi/software_as_built_documentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/link_s_awakening_remake_fishing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/passaggio_di_stato_aeriforme_liquido.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/auto_clicker_root_apk.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_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 5028 bytes
SHA-256: 91f896fb718c45cbe88a37957184597703a60189dce86c90f2835fb026acc156
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 10500 bytes
SHA-256: a2fd9efd4530396b5e53d56e6af5dc2eb4fb4c7aaf115efa8ade0b4bc3787cac

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