Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f27072ccd9287e…

MALICIOUS

PDF

75.8 KB Created: 2021-04-02 04:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f90c78fa28da4ef93f01e1f582fee24 SHA-1: 78369b931b4485df115a3bf07db853e6e9671a69 SHA-256: 08f27072ccd9287ecda4c7ac83dec5ccba0af4694c074c1a7285716d6ac61739
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or distribution network. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the nature of the link farm point towards an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://golowaki.ru/123?utm_term=adobe+audition++gratis
    • https://cdn.sqhk.co/xutazazo/qElhgs9/badukam.pdf
    • https://cdn.sqhk.co/gonolesuzam/3hf5jcB/bebugegaruxufulozutujusuj.pdf
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/vulubig.pdf
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/1018308.pdf
    • https://cdn.sqhk.co/pinofizulag/ghagjfb/pcs_card_recharge_votre_carte.pdf
    • https://cdn.sqhk.co/fudimesa/FhSjeRL/46831823958.pdf
    • https://cdn.sqhk.co/tunuviju/1XFXKjj/survival_craft_online.pdf
    • http://xenojupu.mywebcommunity.org/area_of_basic_shapes_worksheet.pdf
    • https://cdn.sqhk.co/xumirikebixo/gjeqNji/latujif.pdf
    • https://static.s123-cdn-static.com/uploads/4465701/normal_5fdd1d4634298.pdf
    • http://jerimujolegem.medianewsonline.com/522164640.pdf
    • https://cdn.sqhk.co/xugosovemi/dwiidjg/ginizurifozobep.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600cf57d0936f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_1d2d269a226940ec8126516005c008c8.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_add1f94663a54d8a84210a361ab16e47.pdf?index=true
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_e411ddf5ffd9473483461ff0c74fb62b.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_8b798883861f4dc78c29de01af1dc109.pdf?index=true
    • http://livirava.atwebpages.com/parfum_exotique_charles_baudelaire.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_e4cb04dc9895438a82c936381fab3653.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_off0000e46a.bin
acfcb63a06a5e44dc7c2d7414f9b419b295e0cdc1254ba01579c29859d8825d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 5092 bytes
font_01_sfnt_off0000f5c7.bin
ec20ae09efa4058ed017cc0424b694917e6b4c612bf2a8d14537ad16c9bdee3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 14304 bytes

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