Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2aefdd07739ef99…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 11:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 73fb36393ad2789c58d958f0da1e57d1 SHA-1: 50d24b085ac04ce3f7fbe0014d10f9313010aba0 SHA-256: d2aefdd07739ef99671942ef64d5379c3324901757358241110e2cf3b31fdaff
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. The document body, though heavily obfuscated, hints at a lure related to 'daily attendance register format in excel'. No scripts were extracted from this sample, but the extensive link farm points towards a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://xezojetit.ru/123?utm_term=daily+attendance+register+format+in+excel PDF link annotation
    • https://cdn.sqhk.co/fegojujor/fvCvCwr/hyper_run_3d_apk.pdfIn PDF document text
    • https://vosorebozo.weebly.com/uploads/1/3/4/6/134698499/gapipujufuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/p4cPNgc/zombie_haters_mod_apk_v_6._0_6.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/EzYhgIr/fast_rc_drift_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/aicxWjc/22038809245.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/98725.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/gfMppjf/61115222572.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/hG7Jy6b/72808145569.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/ijhetgj/92249757032.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/NzhdjfZ/aplikasi_brainly_apk_pure.pdfIn PDF document text
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/5927585.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/i6giJFw/gsf_car_parts_promo_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_27ed3808829942bd8fddf01e272f75f7.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_61e23ddff3714220915cf67c7a5260f8.pdf?index=trueIn PDF document text
    • http://nufejubonuviwo.epizy.com/gotesuferidiwudapuvi.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_d2efaa7d3ee44de789b74d3666ec62f8.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_13e13039b1b54735b517570678486e0d.pdf?index=trueIn PDF document text
    • http://xilavivugup.epizy.com/tomijobebenadem.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_e51d0cbb960d4930a42a40302eea7bd4.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_f8b264ea6c6a439790203df1b029e32e.pdf?index=trueIn PDF document text
    • http://pitepune.epizy.com/vawusaxawazoxiwufijexo.pdfIn PDF document text
    • http://sufenerog.epizy.com/patton_m._q._1990._qualitative_evaluation_and_research_methods.pdfIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_99ce21a8e4ca48dcb6a63aa5a15c1380.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_8b62fd00f44b48c2b595fd6c7e7ba39c.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_140fad5235b04909a000f5c420b92af4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5508 bytes
SHA-256: 5e7c02453817e841732d3d2235849523ba0a1c07f35714c10e37f96813aa6f2a
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 10248 bytes
SHA-256: 5f81d5e9885afb492e5d819f90d3a73f6e14d9929f76944bea3cd8c5d102456c

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