Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d197ce3a066f5b…

MALICIOUS

PDF

66.6 KB Created: 2021-04-04 11:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16670a87b476e2b18252bd4f2b15bbb0 SHA-1: 7f4129f06fc20cbfaa5d3b418f2ebeca6b348bab SHA-256: d8d197ce3a066f5bf93f8471f978bdc1bf57429d48d5535f2f9cdbcfae269725
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several of these links point to disposable hosting services, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://kuzutuzo.ru/strik?utm_term=mycelium+running+pdf+free+download
    • https://xunujigunabiwuf.weebly.com/uploads/1/3/4/0/134017077/tifixon-xogesikesezede-nijosemazafuk.pdf
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/1305906.pdf
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/bewam.pdf
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/jotopilor.pdf
    • https://tijozamuworibop.weebly.com/uploads/1/3/1/6/131607374/fowadopubit_lumijelule.pdf
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/693515.pdf
    • https://cdn.sqhk.co/rapaxino/jaYRhi4/android_16_cosplay.pdf
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/2731090.pdf
    • https://cdn.sqhk.co/foletesubuf/ffgihgr/werewolf_cat_power_lyrics_meaning.pdf
    • https://cdn.sqhk.co/wijelukifap/iVGghhg/ex_dialer_apk_mirror.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/f939e1ecfd7e.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/1570887.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff858ac4-d96a-4025-b48b-5d570fd21403/excell_xr2500_pressure_washer_pump_replacement.pdf
    • https://uploads.strikinglycdn.com/files/fedc97e1-ee68-49c7-a0ab-93d5b7f12dd4/bojigigedewujekatakizep.pdf
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_a490fe40957e45a0b119fb309fddd387.pdf?index=true
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_9f2c2a363cd94d68851bb47764026c05.pdf?index=true
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_7d5238f1710f475b8dcd9250ed4aa2a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb32d517-aadb-417b-a163-42b27bcc9b48/what_does_murdering_someone_in_a_dream_mean.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_c39cf12d2e794b4480fe51441c487b2a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62b.bin
7378e308153914885a78438f8973af1f64fe4c0646d0277ba902d330e55e65c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC62B 5496 bytes
font_01_sfnt_off0000d8f0.bin
11a825a3d90a320ef84fdb773562a7ddedb275082e2c0c2dbab8d3799e5359ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 10684 bytes

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