Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8191dbbcd0d7e77…

MALICIOUS

PDF

70.3 KB Created: 2021-02-10 20:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2d0bb608febf224a002cbbfe7af0ee19 SHA-1: 43b56af48cae160a660b1a6184ed618d5743eaea SHA-256: a8191dbbcd0d7e776b6918e6e7bace2c819c68578a909ce24496aaee88b7c2da
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains and forming a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan distribution vehicle. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=card+template+for+word PDF link annotation
    • https://lupuxamugegudi.weebly.com/uploads/1/3/4/6/134623484/1689608.pdfIn PDF document text
    • http://italywow.space/polycyclic_aromatic_compoundsv78nc.pdfIn PDF document text
    • http://salonapp.xyz/kirik_party_belageddu_video_song_hd7plgo.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/kugewekudirez_zedevab_pexabewitexa_fiwefezavuzeb.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/2334621.pdfIn PDF document text
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/7398370.pdfIn PDF document text
    • http://ledimpress.biz/29702433321f0wrk.pdfIn PDF document text
    • http://trujillostacoshop.com/short_life_quotes_for_chest_tattoo21xvh.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/ebfa2139809.pdfIn PDF document text
    • http://sbrf.link/chord_hugo_m_scaler_manualt29kn.pdfIn PDF document text
    • https://cdn.sqhk.co/jibibezeva/ygi0jhh/79889227966.pdfIn PDF document text
    • http://morj.space/724639975425p2m0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/59587909805.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/metformina_glibenclamida_500_mg_5_mg_plm.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/manual_contador_autonics_ct6s-_1p.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 5004 bytes
SHA-256: 62f30c7d9cdee30f9814a49ea81e14a7821a796c85d8149b903a63040f74d56c
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10452 bytes
SHA-256: 255517eb30c63030d9e3b5af6f20b5b311c0bec558d54fab1e2fb4c722212867

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