Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873ba8eabcc3465…

MALICIOUS

PDF

87.2 KB Created: 2021-02-28 13:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: befc65d3861917b974182a4dc99c64f5 SHA-1: d1951b42f14dc52a4a3a70eaa24fd48dbbda5a77 SHA-256: b873ba8eabcc346564b92ea1f30d79309dec84d4aa2d342bd12e33d904ab385e
146 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and does not provide direct textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/award?keyword=how+to+reset+luxpro+thermostat+psp511lca PDF link annotation
    • http://iciko.xyz/apple_watch_series_3_data_sheettljrx.pdfIn PDF document text
    • http://citrus-fruit.space/i_inch_binder_spine_templatesbs3vh.pdfIn PDF document text
    • http://serdyukov.pro/vozizedanu7kj2.pdfIn PDF document text
    • http://varnisvakq.ru/junosuvokegusljg6.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/e49b4848f43.pdfIn PDF document text
    • http://forezofulafenu.iblogger.org/dularulafodupitu.pdfIn PDF document text
    • https://zujizivuzilinum.weebly.com/uploads/1/3/5/3/135344014/woxakibemiguwe_mizogaxavaf_dodowutatinigi.pdfIn PDF document text
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/kutevajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fceb076314d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60210042bf6b6.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/dokenulope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesexuxu.rf.gd/sovitose.pdfIn PDF document text
    • http://viputedijanoxoz.rf.gd/sleeping_bag_tog_rating_guide.pdfIn PDF document text
    • http://xifawuzegeliwag.rf.gd/john_deere_lawn_mower_tire_tubes.pdfIn PDF document text
    • http://womawujun.atwebpages.com/darkest_dungeon_survival_guide.pdfIn PDF document text
    • http://sijozorugepidu.epizy.com/pogo_machamp_raid_guide.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_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 5472 bytes
SHA-256: 8bd748e3d924f50228be31f6e35d0542d6241570452a521ee40e4de0eed60e37
font_01_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 11252 bytes
SHA-256: 1a7191a13cef1e487c0f7940a2256cd620b2cc2ec7b6ecb2289a2d789a2618e3

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