Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f75e428041347e…

MALICIOUS

PDF

77.0 KB Created: 2021-02-22 04:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ed0b3edf9aa2e84d75fbdd3c94860c1 SHA-1: 0c5ded59cd36b4c2fb148a1465904ae6a09e4387 SHA-256: f7f75e428041347e9d1ab2e3369a248ca7840c533eb23596d14c75cc2f0c5685
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links, many hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious or phishing sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/strik?utm_term=can+you+take+cuttings+from+devils+ivy PDF link annotation
    • http://ladukusuga.22web.org/33394479727.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/gajegowutidelaza.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/jjgRhb9/the_maze_runner_cast_age.pdfIn PDF document text
    • http://goloturasituj.66ghz.com/24389639498.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/sugigima.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/zekiwidegogebomiz.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/974dc26f0.pdfIn PDF document text
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/7505643.pdfIn PDF document text
    • https://keziwoxiw.weebly.com/uploads/1/3/4/0/134042402/1d8907f6f.pdfIn PDF document text
    • http://tinubovibiwiwi.iblogger.org/nomenclature_of_stereoisomers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedilopasosugop.epizy.com/business_card_mockup_template_graphicriver.pdfIn PDF document text
    • http://tuzipani.rf.gd/tivemuto.pdfIn PDF document text
    • http://jisekexebaj.epizy.com/pozibafogis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 5472 bytes
SHA-256: ebce622545152c920ab10acdc58524325039643f06b598ca90f30a3478b5ec64
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10428 bytes
SHA-256: 482a83460cd6efb30e3581828ec148dfa285dabc8c7ab795aae3171ef31cf0c7

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