Malicious PDF — malware analysis report

Static analysis result for SHA-256 adca0865afd69f20…

MALICIOUS

PDF

75.5 KB Created: 2021-04-22 09:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd004d0952819f5213e376e608be4ee0 SHA-1: 9a8a53b2a8fa5a685c7914e2d2c457bcb25bdd70 SHA-256: adca0865afd69f200850211916b2d5df091cf158c978d3799b9b5c20a71350d1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=how+to+contact+the+dmv+in+pa PDF link annotation
    • https://cdn.sqhk.co/zisujidixa/ChiCFib/bangla_album_video_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujonad/gefOjeO/kujowibidesuduvu.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/3yhcggZ/ravensburger_wolves_in_the_forest_puzzle.pdfIn PDF document text
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/5410234.pdfIn PDF document text
    • https://pojazamajalo.weebly.com/uploads/1/3/4/7/134728500/pifepevux.pdfIn PDF document text
    • https://jitegolugitu.weebly.com/uploads/1/3/4/6/134643776/fizarupujeze_ludig.pdfIn PDF document text
    • http://eglo.club/lirizitalcvpwf.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/gfhcgfO/renoxulibitimodofonibas.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/rubajojiwugumatuvle9vi.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/higinhi/emojination_2_level_16.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/pogisugufuberiw_selul_zajaresubepok_jakikivadome.pdfIn PDF document text
    • http://italysummer.fun/12_kinds_of_tenses3z8qj.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/2efdea5f-c4a2-41ef-874e-f6aa2ae82fc5/boy_scouts_of_america_logo_vector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06865924-438a-4813-b5b7-2ce50c2fa513/weber_genesis_e-330_burner_replacement.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_3857c570d85b42deb25e2549682da5e4.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_42f2fb07edc14adf8998d00fbb46b030.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e73926d-ddf1-44e6-bd40-a2281215961e/best_vocal_processor_for_pitch_correction.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_33edcdc16b274be5a097a8efb3a6f3ef.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_a879b84fcf674dd1b0bb086e29894c54.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_50221d10d04341c2b60dee54c17b8126.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7beb15ec-03c6-4433-9cd2-101606d782d8/central_machinery_5_speed_drill_press_replacement_parts.pdfIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_8ba02af47f304dcda7f08724e075f5f8.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_318525a156974e3fb2428ce444d6483f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25348b27-cfdf-41ab-9cec-0e57cca3f2a2/dakilagutegepow.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_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 5120 bytes
SHA-256: b636691cac1d363e174c698af9848ddc95311c99ef25601cea1673f2871e6801
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10960 bytes
SHA-256: 22e4c024868b529a8fba8ef656750e2f54ac522edf7330df454edc583e5669f6