Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b4ea7e054d30d…

MALICIOUS

PDF

87.2 KB Created: 2021-04-02 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ce1b5832f29501eb5c016a8edfaa4756 SHA-1: 69a91ceeb2be1b1a09710d74d9a8a5971f044610 SHA-256: a72b4ea7e054d30dcf10a90cce539f3ce5b545ac40c069b4bde89592a3a21baa
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The embedded content suggests a lure for downloading software, specifically 'root cleaner pro apk download', which is a common tactic for distributing malware. The ClamAV detection and ML classifier further support its malicious nature.

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://kuzutuzo.ru/wix?keyword=root+cleaner+pro+apk+download PDF link annotation
    • https://cdn.sqhk.co/fawabanof/MXZEhfQ/91085175029.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/kujowafag.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/fifty_shades_of_grey_synopsis_spoiler.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/mPhaus0/derijowukalatufuzow.pdfIn PDF document text
    • https://niritamin.weebly.com/uploads/1/3/4/4/134486676/1595502.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/9ifZKgc/dragon_ball_fighterz_arcade_mode_paths.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/the_lion_witch_and_the_wardrobe_book_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/aMhVP8Q/nozokowibupire.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/vavojadovabiwaja.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/8254072552.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/icHjfRe/kakareva.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/jififobeduk.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/jenokiwugu.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/ludisojemuvopumuniwaki.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/berliner_platz_3_intensivtrainer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_856c5f79f6e0473b8090264da449986d.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_f5c384f1e9754421be9a09fddcebf0a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/bending_machine_for_sheet_metal.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_d01a8164c2b14ed9930d123eda407bbc.pdf?index=trueIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_b82e24dc7030494f9e63d6098ab1039d.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_e4e94e0daada4ac69e6b3cb83597bfdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lepefi/pentax_kp_vs_k70_vs_k3ii.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/wetin.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/wozisarowutexanisawuvej.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000135c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135C6 17268 bytes
SHA-256: b7b646c766e601c7fe45b35124ff3b9a1b0544ef551e5cdae073c5337f19e4f4
font_00_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 5052 bytes
SHA-256: 1ef4a5f7fe5ae37c36d2d643e811985c26fced8c15bea2af2d6d2c24c6500ef2
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 21588 bytes
SHA-256: 599c50064401f25ab51f99db6a8af8b4a2c5c9464e11c72db5eed92a4dc63d46

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