Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efae4a721b79605…

MALICIOUS

PDF

73.8 KB Created: 2021-01-03 13:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 06d400b32386e3e16a3abab697871088 SHA-1: e511057f5d7fc26a186632e82084a6613c6bbb93 SHA-256: 3efae4a721b796056d4cd090db0752049c296f6c5f8b99726c222041f0d9e49f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'traffmen.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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 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://traffmen.ru/aws?utm_term=children%2527+s+bed+wetting+sheets In PDF document text
    • https://cdn.sqhk.co/ludukuni/bigjf8D/tarot_cards_reading_free_love.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/17a9a6.pdfIn PDF document text
    • https://dujinagipufamod.weebly.com/uploads/1/3/4/5/134587046/f52653e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fee484147a31.pdfIn PDF document text
    • https://rufonezovudut.weebly.com/uploads/1/3/4/8/134854931/wotodutagitiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f9a92d826b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_5fab0e8fc2e2d.pdfIn PDF document text
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/50d3bd.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/Czjc1qg/dancing_pallbearers_coffin_dance_meme_gamecube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5fa493877f04e.pdfIn PDF document text
    • https://galafibokuwi.weebly.com/uploads/1/3/4/8/134868726/e2d56e253427.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/widuxade/reporting_anova_results_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/command_prompt_tricks_to_hack_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/57578541667.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/marvel_avengers_alliance_mod_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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 5048 bytes
SHA-256: 0197bd0d50412c33295805823d62404d738244342417be1350f5d123a6d1d679
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10608 bytes
SHA-256: b64be5db218db6d9de4d1dc5d8578f0b358e22a28a0ec19c2a41d649afb537cd

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