Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c637d156868f158…

MALICIOUS

PDF

58.4 KB Created: 2020-11-20 20:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b220a4a8c7c4a96275b3832651f4c339 SHA-1: e9ff21951591d9100c5a8ade0a9cb587f78561bd SHA-256: 6c637d156868f158bf285ce3aa9b9b8d9ff3248331d2808b6aca0f7e7b5b7250
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Carmike cinemas sioux falls'. The presence of numerous PDF links, including one to a redirector, strongly suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=carmike+cinemas+sioux+falls
    • https://xasufedi.weebly.com/uploads/1/3/4/6/134683860/magox.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/4589730.pdf
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/7604743.pdf
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fb61806da4f0.pdf
    • https://dukutisanag.weebly.com/uploads/1/3/4/3/134318107/dujoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/to_kill_a_mockingbird_chapter_4_theme.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/the_fremennik_isles_rs3.pdf
    • https://s3.amazonaws.com/doxifuba/95212839561.pdf
    • https://s3.amazonaws.com/pazifetanegapu/65887572735.pdf
    • https://s3.amazonaws.com/nigimul/13517565637.pdf
    • https://s3.amazonaws.com/jedaxopopuko/guvavemunaduvokabedesona.pdf
    • https://s3.amazonaws.com/tixedujegibex/dezenosawunevaz.pdf
    • https://s3.amazonaws.com/lolaritemukole/duvunesapedikotesibiwi.pdf
    • https://uploads.strikinglycdn.com/files/4a8d07e4-277f-46ab-9fd8-8f1a4471d673/daxutivaruzejiresu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa3a.bin
55eab80312414e1508cd99983efb3ac0a1bb454f96e5631fe472d227d4c4a487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA3A 5064 bytes
font_01_sfnt_off0000bb61.bin
f3e4182c69d1c70a25b94cfb968fcce152ed7a82b9c775d5c9a584f0d4276442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 9912 bytes

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