Malicious PDF — malware analysis report

Static analysis result for SHA-256 f883340ed1c8c1c5…

MALICIOUS

PDF

84.2 KB Created: 2021-05-01 13:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f369d632e05bb4eb0738addbdf3e02c0 SHA-1: 6f3bf486e2439a129c9ef3fe64b70a55f1f45c13 SHA-256: f883340ed1c8c1c5abadc7e0d24110cbe01776c0854261901a4dda8d009b745c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to disposable domains, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URLs and the document body suggest a lure to a link farm, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=what+is+the+best+act+practice+book PDF link annotation
    • http://raponikidosal.getenjoyment.net/35345742755.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/dabilavarijumurupizibi.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/fison.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/baby_cache_covington_crib_instructions.pdfIn PDF document text
    • https://kupejuzog.weebly.com/uploads/1/3/1/6/131637034/xomaxarog-mifud-karupefelezijum-wojenatiza.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/tulinabawobitiranux.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/belap.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/c19a965.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/687f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_c8849463b09247b29a6e91dba10ee04b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/hp_officejet_pro_8600_printhead_error.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/beatles_here_comes_the_sun_guitar_tab.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_ae7841e9e0d44f62be16761d9f7956b3.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_b687b8c9db6b49229e5880013dee9f84.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_c38012233e72443faf04bb2342a0688e.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_ed140caa04f1418eaf2370e38e695e0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/how_to_navigate_dvd_menu_without_remote.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b8454bd9ecec44589e1dc6e19c576db7.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_29e974296d574496bbfcba9d6d266516.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/where_can_i_watch_season_2_of_a_discovery_of_witches.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_b1a8683941744e90967fafaea9f4733a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/bobol_wifi_tanpa_root_dengan_android.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 4888 bytes
SHA-256: 4b2de9ced2b824d8571e15badc36936102684afa0e75ce39e8e3a2e238a5c287
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 10708 bytes
SHA-256: 871c7f77d2cd5cc750dd25eea7517c93af32ee75922df352bf91191a9a193a3e
font_02_sfnt_off000133d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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