Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32b8e931ee19f73…

MALICIOUS

PDF

75.7 KB Created: 2021-03-05 21:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f73e202dc0b7615df6ec648fea5cbdc SHA-1: fba36b5bdb0b7bbfa412a4d19af2870e6df65f7a SHA-256: c32b8e931ee19f73f2ebeb1c17837a9dc8c41779bc1ad24bc48edd9240b67ad8
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, https://nipisod.ru/strik?utm_term=why+does+my+lg+plasma+tv+not+turn+on, is flagged as suspicious. The document body, though heavily obfuscated, appears to be a lure related to a technical query, suggesting a phishing attempt. The presence of multiple distinct hosts and a link farm heuristic further supports a malicious intent, likely to redirect users to a malicious site.

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
  • 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://nipisod.ru/strik?utm_term=why+does+my+lg+plasma+tv+not+turn+on
    • https://cdn-cms.f-static.net/uploads/4387816/normal_600deee5c7c23.pdf
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/1855396.pdf
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fe2451440ce8.pdf
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5fe2cd1e8d379.pdf
    • https://cdn-cms.f-static.net/uploads/4501206/normal_5fe8a087c88ab.pdf
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/xumilazuzewe.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3db7d38fd1.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/53dfd69e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lunojol/18952237473.pdf
    • https://uploads.strikinglycdn.com/files/48956595-7b71-4757-a0e8-0546fd0f72bf/respironics_remstar_auto_a-flex_m_series.pdf
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_a44347ee5a0c47369b0705a1c8934684.pdf?index=true
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_e5fa7861d8b04768aba49d2619951280.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_927ee0a5f7ff4d6c8c76ea0fabef6066.pdf?index=true
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_6090760708a8494bbc6dd719db0dc97d.pdf?index=true
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_341dbb9dee6e43c5a60a07105cedabef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fe9be66e-b132-4f32-bc06-4dde822b094e/hamilton_beach_steam_irons_reviews.pdf
    • https://s3.amazonaws.com/wulotugadag/85698329185.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_off0000eb61.bin
f39673461b043b810c9acafffef1d366a1493fd7c74b9a8b594a94fd54648d61
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5548 bytes
font_01_sfnt_off0000fe2d.bin
3535e97bbea2754175f5af65b172cc4f88ef683a7404695ef09ee9142d2ea7bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10444 bytes