Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b8184b9a33bcad…

MALICIOUS

PDF

74.6 KB Created: 2021-03-11 02:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ab5fb03765079b974483d548d8db6c SHA-1: d099e37fa13d208c353e1747026c3545f7b00200 SHA-256: e2b8184b9a33bcade98c6a88c5a6d0e3e5a482a3d79850e2abfa0c1c0a5240b6
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to attract traffic for SEO purposes, likely as a lure. The presence of a 'download' call-to-action phrase further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=company+profile+design+pdf+template
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5fcddf3fd811b.pdf
    • https://tufulikuzusader.weebly.com/uploads/1/3/4/8/134866114/eb6fe.pdf
    • https://sufogewanogona.weebly.com/uploads/1/3/1/0/131070160/5998501.pdf
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/xabigabefulivemufin.pdf
    • https://cdn-cms.f-static.net/uploads/4414358/normal_60215f5035673.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fea2398139e3.pdf
    • http://xulazawelinuze.scienceontheweb.net/pazeno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nabenejajoko.myartsonline.com/55886446436.pdf
    • https://s3.amazonaws.com/liguwubore/catheter_related_bacteremia_guidelines.pdf
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_7da273572d8947d8aa8030c8906ade9e.pdf?index=true
    • https://s3.amazonaws.com/lixisariwulo/7719139237.pdf
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_c58e35c90acc4f31b80afa327459933c.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_f45a3550794d427a81a5826b766eb102.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_ffcda863b8844decad368c3e573cc04b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fcda1939-86f7-4c38-9487-af9f5c6d3ae2/12_piece_survival_knife_set.pdf
    • https://uploads.strikinglycdn.com/files/09553d24-149c-4c8b-b045-039577150219/how_much_does_a_bale_of_straw_weight.pdf
    • http://tiwatimab.atwebpages.com/define_graphic_novel_definition.pdf
    • http://jujobope.atwebpages.com/analytical_and_synthetic_method_of_teaching_mathematics.pdf
    • https://uploads.strikinglycdn.com/files/c35b8609-0358-47d8-bf22-8c6ef5d41562/the_new_deal_great_depression_definition.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_off0000e77d.bin
376c074f1ee2692dcd0d3b24cb36fc086b4a0ae09a5e98c47482c5a3f3ca734d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 5368 bytes
font_01_sfnt_off0000f9ae.bin
0a4f1ca177e62da16cb0a12e754f7da79bc5bcd9c1dcbce650c27f60206e203c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 10412 bytes

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