Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d21bd15e938e2d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 12:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f088f5efd1d7231a0e28f79a47d4d722 SHA-1: 712c7f01892258d708ca86bdb292cce9b3f50416 SHA-256: d7d21bd15e938e2d98145f489e3b3d9b61574d378a9efcdfb8a229a5d72a7d67
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/award?keyword=rattlesnake+point+climbing+guide+pdf
    • https://cdn.sqhk.co/texafikogot/jciaih4/pilot_flying_j_truck_stop_app.pdf
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fc5e1ec939f1.pdf
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/mufil.pdf
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/duzazogadomuwus_zuziruvom.pdf
    • https://cdn-cms.f-static.net/uploads/4494139/normal_603c3f6c6b7a0.pdf
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/5226970.pdf
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/renibavujal-litiwogujenid.pdf
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/e837e4c608a77b.pdf
    • https://cdn.sqhk.co/dupeguwova/ihhhsje/17876079003.pdf
    • https://cdn-cms.f-static.net/uploads/4367296/normal_60405c004fc48.pdf
    • https://cdn.sqhk.co/wibetaxor/dCjdyAs/zombie_world_war_z_2.pdf
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/e0a757ab3.pdf
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/5ca6a5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_ca4bc9b7146c4a889ba975e52543142c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/763318f5-34da-42e7-b0ed-3c80108098df/ponekiresuko.pdf
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_9ab7c2339e1b40dfb361b47b7c4e5f66.pdf?index=true
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_9647db4645a24543a0edf02bf5c14ffa.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_2a497770b8994182bd41a9ccb1dc98e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5d887e84-48cb-4e1a-b153-593026a88048/why_do_old_aspirin_tablets_smell_of_vinegar.pdf
    • https://uploads.strikinglycdn.com/files/8206d6b2-3864-4bea-aa8f-eb4e6cbd7f3f/vapub.pdf
    • https://uploads.strikinglycdn.com/files/2b037591-f884-47ca-9712-ab19f70ef99d/python_beginning.pdf
    • https://uploads.strikinglycdn.com/files/a808ba6a-6e83-4bc8-9ae2-5949f4e77b83/volexobojuzixufof.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_bcfc1056c68747ae9af62347b8320c15.pdf?index=true
    • 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_off0000ebcb.bin
ab599424e7a9d8e47b0165833190960d0cc79dc8178c2c7fcee7459d5bb77f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 5588 bytes
font_01_sfnt_off0000fec8.bin
bed8ce8a2f8e0f01bccd80429772c0c40efb878e22fec808a4073afe05d9ba2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10444 bytes

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