Malicious PDF — malware analysis report

Static analysis result for SHA-256 795737969a2cbbf9…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 01:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ce34aed4664ef58fd4ab580125074d8a SHA-1: 0ff34612ab9a2bbb086f24ac892106a402852f38 SHA-256: 795737969a2cbbf927eb77a0ed17bbf0987057ec35640bbb2632ebd6ae5d2e48
186 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, presenting a seemingly legitimate manual to trick users into clicking numerous external links hosted on various disposable domains. The primary URL, 'https://xajibur.ru/strik?utm_term=norcold+1200+rv+refrigerator+manual', is likely a redirector to further malicious content.

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://xajibur.ru/strik?utm_term=norcold+1200+rv+refrigerator+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6049b5db2193b.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/K0Mhjib/minecraft_mods_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/iacijKm/kof_2003_arcade_cheats.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/how_to_build_self_esteem_and_confidence.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/Riibeha/nalamafemupez.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/ia6hfC7/90230719156.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/dMIjaij/3715779253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_604656226e6b5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/hab7Jig/couples_halloween_costumes_hot_dog_and_bun.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/delefisuselujajemirefen.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/iaicvsE/fitbit_charge_2_setup_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_6026bb680c866.pdfIn PDF document text
    • http://dewodalaluw.mygamesonline.org/zijotefexetadizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6011fbff957ce.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/FfFghjh/train_timetable_sydney_to_wollongong.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5ff9a3ed52988.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/Vjcbgex/41157314713.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://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_69241a8b78404725b5f79ba87856994d.pdf?index=trueIn PDF document text
    • http://xijewixevav.onlinewebshop.net/brother_dcp_7065dn_drum_unit_reset_instructions.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/sig_et_amnagement_du_territoire.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_5d27cd7953df451ca84757c354c8bebb.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_3dc919c1125e467da6b20cf2482a0491.pdf?index=trueIn 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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 5400 bytes
SHA-256: 3eaff3a7704fd5bebe6f228c1443563cd7650bda26fd44a9d5dd0587b222bf97
font_01_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10776 bytes
SHA-256: f9dbd10e6584b8d939c620b56791e8d5e873d7129494d919d39e6c6b3d168f62
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333