Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1b9e09a9fd8f77…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 07:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c55e5bedc881426715a4a6e73b929ed0 SHA-1: 2436fd208b3b4de3201fdd0657c6350faef5e385 SHA-256: ad1b9e09a9fd8f77022e2422662c3246c86f1a6720dfd955c0355b08210d306c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=arrayadapter+trong+android PDF link annotation
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/5512286.pdfIn PDF document text
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/6881988.pdfIn PDF document text
    • http://desawigoxikugaw.mywebcommunity.org/20729117079.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/70054015378.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/91831264873.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/frigidaire_gallery_dishwasher_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/nhdMNha/pottery_designs_ideas.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/3320110.pdfIn PDF document text
    • http://sujolisake.medianewsonline.com/cracking_the_pm_interview.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/2Zgjujf/ultimate_fishing_simulator_lure_guide.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/anlise_envoltria_de_dados_livro.pdfIn PDF document text
    • http://peteferix.mypressonline.com/batejotekawawavusa.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/which_best_describes_how_theoretical_probability_is_determined_apex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f57b9a-2f21-4941-875e-815c6fd4ee7d/ask_and_it_is_given_free_download_full.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_ed5635fec4844fa89dadfee317a93793.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24addd5-65da-4f5c-9644-bf469128f219/canon_pixma_mx922_cartridge_refill.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_2e1e779f83af4141a9a606aa4c57b309.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/57536870126.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_225b11dcced84dc0891b6942122c6d8a.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_0fbccd29b4954c34aa4cf9fae3d3708e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e140f07e-914e-488c-a799-8292605de232/falcon_4_bms_vs_dcs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d403b8cf-f450-4f37-b8ea-60065776d1ef/how_much_does_it_cost_to_install_a_viper_car_alarm.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 5008 bytes
SHA-256: 7d5ad16ac1372d517dedd4f2c4ed54769aca2b290feb4409fcd070130902ad18
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 22812 bytes
SHA-256: edd915a2d1059219b0f32bd33eea5c2904ee3fd92b91e7484514b9c342dbcf84