Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a8153c9aa86b18…

MALICIOUS

PDF

86.2 KB Created: 2021-03-09 15:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03551fa20e83f678f46bded3088816d3 SHA-1: 1884d12ab41e46d94f12aad85d14dafbc545f141 SHA-256: a7a8153c9aa86b1859c4c14204d08576b6e0e49717ec327209eccd5ef421d9fd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. One of the primary external links is to `https://dafemum.ru/123?utm_term=bad+girl+song`, which is likely part of a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

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://dafemum.ru/123?utm_term=bad+girl+song
    • http://mapotilij.mygamesonline.org/international_business_the_challenges_of_globalization_free.pdf
    • http://kazimibi.getenjoyment.net/25852498757.pdf
    • https://tunogurepuxi.weebly.com/uploads/1/3/6/0/136054619/xejufegaja_lujobavafukaw_bilovi_dukiloxobuvik.pdf
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/3098692.pdf
    • http://megatorg.ru/sadazedugapokesele1a3xu.pdf
    • http://mavpa.fun/belkin_n300_range_extender_wont_connectrqlg3.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/7e67250.pdf
    • http://ppl-nutrshopfit.website/david_and_goliath_australiaejdev.pdf
    • http://nusowutevu.getenjoyment.net/tesla_model_3_performance_price_2018.pdf
    • http://reduslimitalia-official.website/joxalewidusevamanixa75hbg.pdf
    • http://sowoxapexemex.sportsontheweb.net/best_star_map_for_ipad_free.pdf
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/683157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_9362a095f4d44a6895345c5205af5538.pdf?index=true
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_210b37635c324975bca5aa816891e5c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/63da2c7e-3f0d-456c-b493-61d58027f958/dr_jekyll_and_mr_hyde_chapter_5_quotes_analysis.pdf
    • https://s3.amazonaws.com/nisoxow/17861096424.pdf
    • https://s3.amazonaws.com/fibesezati/coreldraw_2018_crack_free_filehippo.pdf
    • https://uploads.strikinglycdn.com/files/90cc79d6-f775-4d97-a714-ad4df68891d0/fire_and_blood_book_art.pdf
    • https://s3.amazonaws.com/nelizenejakarug/bromatologia_veterinaria.pdf
    • https://uploads.strikinglycdn.com/files/8119abf2-f06c-4726-a028-dade073ae627/74159969383.pdf
    • 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_off000115cc.bin
21e313f634ee9927cfd88b74a9861c7bc9dda81bac91e4e34d7829106dda3579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 5044 bytes
font_01_sfnt_off000126ff.bin
6d6feec47bfaf2033aab29d55306cad0e2b83e5d835b97dc722d1875edde1753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 10944 bytes

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