Malicious PDF — malware analysis report

Static analysis result for SHA-256 79887fd0c998a315…

MALICIOUS

PDF

75.0 KB Created: 2021-02-26 21:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: df80079fecae9fe1290b5d6f65ce3a57 SHA-1: da405e7ccded334ba0cd2fb29d2a4f62b69532d3 SHA-256: 79887fd0c998a31528df7c7011d6604418eff0c74a670d618ff18102cf37e8e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The document body, though heavily obfuscated, contains keywords related to printer maintenance, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=how+to+reset+epson+l3110+ink+pad PDF link annotation
    • http://rent-nout.site/koburiwaxomasesaxezoremv2xqu.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/sitoxitona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5fdf6bbc94299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_602ea714d6c01.pdfIn PDF document text
    • http://promooffer.site/rivomexesuzubobolukumux1t5xs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_601f627f8dd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60322bb8e9b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_600cd166c7e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452845/normal_600102dda9665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd146cb221cb.pdfIn PDF document text
    • http://fuxinagerepika.iblogger.org/story_of_my_life_one_direction_lyrics_az.pdfIn PDF document text
    • http://lepozejivi.22web.org/89730178626.pdfIn PDF document text
    • http://bitcoins-profits.com/how_to_install_coffered_ceilingbxwvk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_602253a8defd5.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/rituals_of_memory.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/when_did_prehistory_start.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/nikon_p5100_dpreview.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 5428 bytes
SHA-256: c65e3732c994f691442ee9e3f5bdc25ff697da58ad4e8eea6b139b81e4875ac8
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10912 bytes
SHA-256: 1145bb695217ddbd7becdd50984ef1b623cb7ebbbb21841e39a5d114d24cdf90

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