Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08a8b863613f481…

MALICIOUS

PDF

88.6 KB Created: 2021-03-18 04:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 77921e324156dd25b52a1dcdf95777d2 SHA-1: b6b94cea950e56fd2851317ec3c48584d9c151e4 SHA-256: b08a8b863613f4810c4e993ef83b84cdc5eb8aacc6d4e2f17515367bb963aaf2
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jumiwimov.ru/strik?utm_term=alice+walker+everyday+use+pdf PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/2b0b15b025f5.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/9864663.pdfIn PDF document text
    • http://carishr.com/42086069257xm2sj.pdfIn PDF document text
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/18856.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/9cb4c98a8cd.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/kupivijelado_pomeripi.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/pikikojo-sirukoti-zagunod-mudenizifedosom.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/0308cca57855.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/mCfGejf/merge_zombie_idle_rpg_mod_apk.pdfIn PDF document text
    • http://mishabelle.ru/ademco_vista_20p_installation_guideebhh3.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/664cfcbb.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/liwugawofanis_kibunerup_fafokudopifuni_wowivemelibu.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/laageYO/vavotumiriwofu.pdfIn PDF document text
    • http://dkblogin-de.com/77295382676wwrhq.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/googhhg/zokefazozakigemidemogiko.pdfIn PDF document text
    • http://perekon.22web.org/39768060440.pdfIn PDF document text
    • http://fojowufuzuno.22web.org/84827690223.pdfIn PDF document text
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/3725269.pdfIn PDF document text
    • http://reduslimitaly-official.site/taurus_millennium_pro_140_holster0lwhr.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
    • http://finuzajobozosom.epizy.com/15415401170.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_b4c3113979404baf8343d12a2da6df56.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_fdd5bf4834a8414cad676653301f5033.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_bf24f6f7695047fa8a9525920a7301df.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 5044 bytes
SHA-256: b194e9f225830bbd0a24e32ab96d90042d2129ec59207bb26a496a7d07d900db
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 11168 bytes
SHA-256: a3e8736fc17abb49cce32e0e26297da3e09a9db6e7fb74e27e53a149c6a1a6b3
font_02_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 16164 bytes
SHA-256: f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd
font_03_sfnt_off000144a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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