Malicious PDF — malware analysis report

Static analysis result for SHA-256 abff391e6a2add14…

MALICIOUS

PDF

81.9 KB Created: 2021-02-21 12:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cdacc064a532c15ce14d9b3287081d SHA-1: a8eb1aadb3e7f6a52f5ca26ef8ba28063dec072b SHA-256: abff391e6a2add1430347709c6d949062b7dac68fb65a95161710022f3085020
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one external URI with UTM parameters suggesting a phishing lure. The PDF structure and embedded links indicate an attempt to redirect users to malicious sites for further compromise.

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://maypoin.ru/strik?utm_term=the+man+who+couldn%2527t+stop+the+truth+about+ocd+pdf
    • http://todayshop.website/86834737083c8nv7.pdf
    • http://opssmall.space/nutrition_for_dummieswyhou.pdf
    • http://edapog.online/biologia_del_desarrollo_gilbertczs26.pdf
    • http://sy0n.icu/ecommerce_wordpress_templates_freeu9pk9.pdf
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5fe851b75e343.pdf
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/jepexamatabisuzep.pdf
    • http://radanews.site/7196656033739wm.pdf
    • http://detonic-italy.website/my_little_pony_harmony_quest_game_online_playxz81g.pdf
    • https://static.s123-cdn-static.com/uploads/4402478/normal_60063893dbe80.pdf
    • http://good-production16.site/fosekuxegudopijiturem36c1h.pdf
    • http://freds.space/mendeley_abnt_styletplou.pdf
    • https://static.s123-cdn-static.com/uploads/4424328/normal_5fc82af283b4e.pdf
    • http://giocodigital.website/67605302313bt8l9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sefabe/nonativulitegem.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/android_app_transfer_files_via_wifi.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/anonymous_vpn_free_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52b.bin
22e0a11b0aebcf2a527f8148b8106ddd83bac84d82ec21d17f10d3d61f495515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 5444 bytes
font_01_sfnt_off00010794.bin
2b097a3b86eda63abbd4a3762fdf0abc260c242704e2b3d5e96357e747aa4121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 10596 bytes
font_02_sfnt_off00012bdb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 4324 bytes

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