Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad36fb65d830b65d…

MALICIOUS

PDF

67.7 KB Created: 2021-02-11 17:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e3aab9fcd2f87985462dadee86add27b SHA-1: ee9b67a90495e6547482ebbf924fcee84ad0c1e0 SHA-256: ad36fb65d830b65d79056e585d2362fce4678f868522e3cbc19f2b049ca7a4c0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'yafferge.ru' as malicious. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the document's structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=roblox+assassin+values In PDF document text
    • http://olymp-trade.top/pesapu331m.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/ijboCiR/junenedesesikoximupobuma.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/bexokut-zozigetizuri-kakopowit-sadolizawakax.pdfIn PDF document text
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/rigibemoselasuzan.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/wowibuxikuwoji_satedon_gubebulug_jokujamom.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/hjiyBge/97334011690.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/5ejaLji/dino_run_chrome_web_store.pdfIn PDF document text
    • http://reduslim-officialsite.site/15727630027qy9d7.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/BXifmgj/tux_racer_download_mac.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/jenawopimaxuran-weroteganitolo.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/vikif.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/b11jghd/kendall_and_kylie_fight_kuwtk.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/xoguwavosuje/beautiful_animals_images.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/50884790414.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/assetto_corsa_competizione_setups.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_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 4660 bytes
SHA-256: 77b2cd21ba7211b947773f5ddd2f9b6f7b3a9a4e19c54a47b5cc11b441f0d717
font_01_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 10084 bytes
SHA-256: 8f5ed2b430375c5f3576753286c4bc11067cd33d58594429825cd450b6079c02
font_02_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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