Malicious PDF — malware analysis report

Static analysis result for SHA-256 136cb7b63ada004e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-01 15:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99d648221bed213f18a9a27254b853e4 SHA-1: c2d00c33272f9255817d204dffda1eb90f0ae742 SHA-256: 136cb7b63ada004eda2f318446b187eca93bb0a28d4ab57b0c431c1fd89f0a84
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://mezovuduw.ru/123?utm_term=python+list+remove+duplicates+by+key PDF link annotation
    • https://cdn.sqhk.co/fuluzagile/hejijhL/idle_stickman_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_600f8d6d9c1c5.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/kLihjjz/kaxatazonax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5fc9a255df3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6010f67078642.pdfIn PDF document text
    • http://keripudatoxene.iblogger.org/what_is_asatru_pagan_religion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_6031877bbfb1d.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/53443310113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_602dc5298266d.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/wixurerejizuwovonul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5ffa863041e80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_6037870e64b23.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/driver_vga_lenovo_g40-45_windows_7_64_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/how_to_use_ge_digital_timer_with_astro.pdfIn PDF document text
    • http://sidajewaset.epizy.com/gandhiji_biography_in_kannada.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 5680 bytes
SHA-256: b181afa75a93b161dfa62bfa0f5314a3e6f997eec64b691d7f080bdc4fd98d55
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 11912 bytes
SHA-256: ad6ad4df3429d15acff439b3497ba54259cd8a7a4842ea8025d39a0931bbe011
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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