Malicious PDF — malware analysis report

Static analysis result for SHA-256 1752ec48177f8bbe…

MALICIOUS

PDF

82.2 KB Created: 2021-01-06 08:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 612c2750153ec0aa522bd10331fa9af8 SHA-1: 7da7b424154fb4c6b24c3ee89a1fdc3f8eecd830 SHA-256: 1752ec48177f8bbe61414c7a1b7f36d58d4bba821a0e16e465ca81ceba01bfe8
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to link farms and redirectors, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'traffmen.ru', suggesting a malicious redirection. The presence of a large number of external PDF links, as noted by 'PDF_SEO_LINK_FARM', further supports the attack pattern of obscuring malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=tarrega+adelita+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5faeecc4ec76e.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/Z2Bgdgj/fafivorubutuwufe.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/hggj4gd/dajadalopuf.pdfIn PDF document text
    • https://buwirudoxux.weebly.com/uploads/1/3/4/5/134597973/a134547.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/tezisabuka.pdfIn PDF document text
    • https://limogugopowara.weebly.com/uploads/1/3/1/6/131637055/gifup.pdfIn PDF document text
    • https://bururinuriz.weebly.com/uploads/1/3/4/8/134882015/96236a3ecf.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/sojezudozenenoga.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/zumomasugipeno/73091928813.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/13081542267.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/tulubifejufi.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/26074979562.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/14902402129.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/wapakared.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/assault_android_cactus_co_op_xbox_one.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010fb1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FB1 24712 bytes
SHA-256: a82d75c885d91a56d6b705b539702c325cbffae18054a35f99cfb1a32e49ca09
font_00_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 5300 bytes
SHA-256: 0b3ac6091656de27a89666b380464368a5410c16cbd5c0eb5dede24314a476f5
font_01_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 11576 bytes
SHA-256: c625676f7d894f682a749d6df68071fa3812e518960f2105325e991861f71c62

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