Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42c4281c38b33ff…

MALICIOUS

PDF

79.8 KB Created: 2021-01-11 02:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 58df81dba75c5b697b036cd763dd1a11 SHA-1: 93e6de06dc94a51702a85e0dcce861c5991df63b SHA-256: e42c4281c38b33ff07f6fc2bd6f5b1d6c07f47ebef27e97e7d1d06d9fcc4ae20
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffking.ru/123?utm_term=word+problems+keywords In PDF document text
    • https://cdn.sqhk.co/kejofuvata/Woq6ggG/94620847462.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/gigh2gd/green_party_policy_definition.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/d7cf861.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/6004878.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/ghIggo6/metegesur.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/1652790.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/PzHheEu/classwork__class_work.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/gichfzO/legend_of_the_sword_in_the_stone_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/simple_guidelines_for_diabetic_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/biological_science_freeman_free.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/veer_zaara_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/efectum_pro_apk_rexdl.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/windows_10_full_version_with_activator_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/civilization_6_mapuche_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 4860 bytes
SHA-256: ecdf43903857c1abad48934669f9904e96f72fab79b7c1df18bd70abb1c17f57
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 11728 bytes
SHA-256: 36a3a54cd08cc4763332755c4c18a718cec512bafb2add6cc9e1249abd2db01b
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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