Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ebebcf83d717e4…

MALICIOUS

PDF

80.6 KB Created: 2021-02-13 20:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d6849819c1a3e4c6ec2d56e979c4dd6a SHA-1: f193d4f48370a07a6a60e6ec077c89aeb2edcee2 SHA-256: 71ebebcf83d717e414d8ef0671b8962efb8a537cd3d34002dfd350408365573d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious. The primary purpose appears to be SEO manipulation or distributing other malicious files via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wb?keyword=berhampore%20to%20ranaghat%20train%20time%20table%20pdf PDF link annotation
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/boxunin_gukapovuzek.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/ijjgkhj/zombie_counter_attack_killer_mod_apk.pdfIn PDF document text
    • http://dakolozen.22web.org/hmc5883l_compass_datasheet.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/82ad0b20.pdfIn PDF document text
    • http://ig-support-service.com/pevutivewojobixatiniuqrc.pdfIn PDF document text
    • http://deutschebank-meine.com/62952986170ojb70.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/7549989.pdfIn PDF document text
    • https://dobidikomopal.weebly.com/uploads/1/3/5/3/135302797/bezuxazabi_lufel_kufaxijalas.pdfIn PDF document text
    • http://hookup157.online/dekebigoxuxuzulixafuxiracxcxs.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/jclODMq/air_force_reserve_special_warfare_officer.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/hieghhf/84643730471.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/ahciGib/14471559246.pdfIn PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/7147937.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/iQjdp5Q/formula_1_acceleration_0-_200.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xesigeze/envision_math_grade_1_teacher_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/65443895989.pdfIn PDF document text
    • http://gipanitefoj.epizy.com/55518342157.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 5256 bytes
SHA-256: 16a29ca4f93a60a005088f6e788cb1daa8b40f9faac97bd8a5d57065b927d37b
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10912 bytes
SHA-256: 4d70d11b534e9c5bad35c5bd032695b78d0f413dcbe7adac32a0fb3fe28330da
font_02_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
font_03_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 5584 bytes
SHA-256: d18ab59ce7e0d390c6bc17199eea0d5d4c1f43605dd1a97e4e17fb55cf63a9cd

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