Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2049faadc40225…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 23:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6205a3808143cc3cb2a2b443ca5dbdc5 SHA-1: d58afa442b2b17e7d03d94ed4ddf6d7dcce592b0 SHA-256: 4b2049faadc40225233d98a33117ec986694a941f98ab189f4e5b55c3bb61499
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=taylor+ice+cream+machine+for+sale+philippines
    • https://cdn.sqhk.co/dufimogemeka/uiiiaja/death_city_zombie_invasion_hack_mod_apk.pdf
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/c6280e9.pdf
    • https://cdn-cms.f-static.net/uploads/4446270/normal_5fe77eb37321f.pdf
    • https://cdn.sqhk.co/rajunakeb/FCVBiaw/burokebudiruviduvorenu.pdf
    • https://cdn-cms.f-static.net/uploads/4451762/normal_60540380aaa9c.pdf
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/314935.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6032caaaa931f.pdf
    • http://zodimasar.mypressonline.com/71241926075.pdf
    • https://cdn.sqhk.co/fekigimuzib/ligBhco/crossword_clue_solver_app_android.pdf
    • https://cdn-cms.f-static.net/uploads/4375886/normal_6019281b987ff.pdf
    • https://cdn-cms.f-static.net/uploads/4366623/normal_6022e7a618aa4.pdf
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/soloran-kuwubev.pdf
    • http://dusejetiwogodad.getenjoyment.net/el_alcoholismo_monografia.pdf
    • http://mebevevi.mywebcommunity.org/who_won_christmas_caroler_challenge.pdf
    • https://cdn.sqhk.co/gojikanemiju/kjaeheg/gofobebe.pdf
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/9750947a8904.pdf
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/nokeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_760b69bc34f94d758d0aba4c9032a1bb.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_7bd279ec7df84b71939073d0556877b9.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_862298e4eb0e4655bc73fc84f39406a5.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_cb2c932da04b4493b1b0aae90ed97c56.pdf?index=true
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_68516a8b2c19454ba0840168066e2844.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_8fb8b6d1c1514bcc97f01ced13dcca4c.pdf?index=true
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_836ad93c5aeb4cd59303423e7e76ba1b.pdf?index=true
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_650b6003e0fb4159a9a2debdb94816df.pdf?index=true
    • http://bodegifu.atwebpages.com/32954953193.pdf
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_888ba68d68cf48419ba3452e293562de.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_off000102f6.bin
a6c4e31b2f331b1f7c7f4f07c73fdb5d722ebc5f387a9ce368e59f2221287970
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 5308 bytes
font_01_sfnt_off000114e5.bin
cc288d1663bd23f095fbe6789965bf15c3289aa6a3b076275664e9bba76fda94
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 11396 bytes