Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacbf7f6b06c3ee4…

MALICIOUS

PDF

74.8 KB Created: 2021-03-08 18:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3f43f08a9e58d08e03d2ff4906131b9e SHA-1: 42a7345ed6cee367098ea4ccef746d681521c93f SHA-256: aacbf7f6b06c3ee429a96a4d6f63a3d7131031fe9491a86a13e4355ca2dcfa12
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ponafet.ru/123?utm_term=java+swing+book+pdf+free PDF link annotation
    • https://cdn.sqhk.co/tabakotodi/jihihhg/65642632918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_6026a692b7729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_5fd9033c604dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5feff5b502849.pdfIn PDF document text
    • https://badexakabenal.weebly.com/uploads/1/3/4/0/134017850/guzezijoginevo.pdfIn PDF document text
    • https://koxijarekaze.weebly.com/uploads/1/3/5/3/135326688/337322.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/Ahfjbjc/19680917533.pdfIn PDF document text
    • https://dunevija.weebly.com/uploads/1/3/4/3/134306837/pupelevega_lamorik_pawipuzulexuf.pdfIn PDF document text
    • https://napopetonepew.weebly.com/uploads/1/3/1/1/131164038/4e98ce2a8.pdfIn PDF document text
    • https://cdn.sqhk.co/puninuzono/i7jeos2/devil_ninja_fight_1._2_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5ff0c57b6cdc0.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/chfEZhh/nuxatupamamegoxupesuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/bjbF8Ss/download_gacha_club_mod_apk_2020.pdfIn PDF document text
    • https://nulaxevaximuji.weebly.com/uploads/1/3/0/7/130776814/5735834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dukajevo/bragg_s_nutritional_yeast_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/8949679294.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/82625170730.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_b6b8a53783e54c358599d6042273a60f.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_75d7d07499b3438c92cc913e6c21af35.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_2408d0294d8544ceab31b7624a90af0e.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_6a274c15e2dc42678c5a4615f0890492.pdf?index=trueIn PDF document text
    • http://vegawududabuz.rf.gd/how_do_you_cook_a_costco_spiral_ham.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_32be6971745c456f9d17fa7f77586396.pdf?index=trueIn PDF document text
    • http://tixelupaninaber.rf.gd/palavatujuwakil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 5232 bytes
SHA-256: 4c23df43acd231b46a5a58b799b532ca7cb6ec611551000f46318d2b1d05678a
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10604 bytes
SHA-256: 8aad1142fb217af017c7656748f82f7163fdd31a671ba6f84b299df1586590a0
font_02_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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