Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaff88319712726…

MALICIOUS

PDF

76.5 KB Created: 2021-01-16 16:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cc8daa00531b9a171a0770d9d7cc167c SHA-1: 9bc8b05a4ede91ff240d95c3ceb2069df0f06ac6 SHA-256: dcaff8831971272673cfe565e92d015f4735bcec06ef28d6073d0d76f6d781e8
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one pointing to 'traffset.ru', suggesting a redirection chain for malicious content. The PDF structure and embedded links indicate it's likely used as a lure, possibly disguised as a report, to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://traffset.ru/aws?utm_term=internship+goldman+sachs+report PDF link annotation
    • https://site-1218722.mozfiles.com/files/1218722/lupobinadomijojeg.pdfIn PDF document text
    • https://vizomitula.weebly.com/uploads/1/3/4/2/134266598/xuxijivadota.pdfIn PDF document text
    • https://redewude.weebly.com/uploads/1/3/1/3/131379671/bolelonud_vitedelelipiz_bagujifesa.pdfIn PDF document text
    • https://site-1176202.mozfiles.com/files/1176202/69474156341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5feea1c08e101.pdfIn PDF document text
    • https://site-1204796.mozfiles.com/files/1204796/diaphyseal_medical_term.pdfIn PDF document text
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/2056910.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/sonupani.pdfIn PDF document text
    • https://site-1176140.mozfiles.com/files/1176140/zombie_running_phone_app.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/fisulefajow/meme_generator_free_uptodown.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_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 5212 bytes
SHA-256: f6f596223254b916d4ceced197dd9356defdafd6173bbafc880ce0c7c7c90cb5
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 9976 bytes
SHA-256: 8544c5c2ccdabdc52de2efca51252ef22cb709df64d8a43b53d903ba480795aa
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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