Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0b4548371939fe…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 07:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edf6e3ff89da86f35594f1cb27437c34 SHA-1: 7fbd992466d320fb1acc31f141601a21bdf6edd2 SHA-256: 4e0b4548371939fe76cbbbe5e1c05ba5137b3a849260df9a902ce3c286090961
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jacksth.ru/strik?utm_term=watership+down+book+age+level
    • https://cdn.sqhk.co/wogirujut/d53gggM/pixel_gunner_hack_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_600f9d683f02a.pdf
    • https://cdn.sqhk.co/gulanuwe/pifpPy0/19227268702.pdf
    • https://cdn-cms.f-static.net/uploads/4446499/normal_603270eb51142.pdf
    • https://cdn.sqhk.co/zotofoza/g61jjhf/airplane_movie_meme_generator.pdf
    • https://cdn.sqhk.co/sebidurubuze/iggChfe/star_wars_movies_in_order_of_release_imdb.pdf
    • https://cdn.sqhk.co/mevazasid/iheQidi/pejijajokovuze.pdf
    • https://cdn.sqhk.co/gosukutusu/gd6gigc/gravity_ninja_2.pdf
    • https://jijofovi.weebly.com/uploads/1/3/4/7/134755656/kokubanitobo.pdf
    • https://cdn-cms.f-static.net/uploads/4473637/normal_602aade09a47b.pdf
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/saputijimogob-xuxavukemu.pdf
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/bexibatab-lalotigurawodo-wofafozegen.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fdbd3c56eb91.pdf
    • https://cdn-cms.f-static.net/uploads/4461780/normal_601bc3bfea4cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/befarekogol/84863430434.pdf
    • https://s3.amazonaws.com/lerezazo/gajuzuzefid.pdf
    • https://uploads.strikinglycdn.com/files/55842cdd-0682-4029-880a-bd9587333ac0/24128537190.pdf
    • https://uploads.strikinglycdn.com/files/dbd04362-28a5-4dc4-8781-bb0d874795ff/the_hitchhikers_guide_to_the_galaxy_summary_chapter_11.pdf
    • https://s3.amazonaws.com/gogonof/application_form_for_scholarship_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e8.bin
419a36d8ff9b93ee346b26c8b5f1c1694e93641c4fc691fa68016397f28981c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 5380 bytes
font_01_sfnt_off0000fb40.bin
ac7e4ad7995621f72c1abc499d42d9da541812e7d353bbde9e393512d83552e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 11252 bytes
font_02_sfnt_off0001216d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 4324 bytes

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