Malicious PDF — malware analysis report

Static analysis result for SHA-256 e879d058b6e5eb77…

MALICIOUS

PDF

83.9 KB Created: 2021-02-15 20:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a239b0ed940e2107e708eaae8a504341 SHA-1: 35228a9d4f32ded3ff6b22b8337aa8f7b4043e49 SHA-256: e879d058b6e5eb77cd51583259542c38d1ab1ae3be2b1a4b0b84363f9f1e59ea
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs extracted is https://leonvi.ru/wb?keyword=arris%20modem%20dg1670a%20review, which is likely part of the lure. The document body, though heavily obfuscated, contains references to 'Arris modem dg1670a review' and authoring application details, reinforcing the lure. No scripts were extracted, but the overall structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=arris%20modem%20dg1670a%20review PDF link annotation
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/4b3860e898b.pdfIn PDF document text
    • http://sberpodarok2020.online/backpage_edison_new_jersey22zec.pdfIn PDF document text
    • http://nalatakojuzali.iblogger.org/37747248388.pdfIn PDF document text
    • http://mybatut.store/27953090146ctmoj.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/tapiwifire-babuxuga-rowur.pdfIn PDF document text
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/2d8d736ba69e3b.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/sadumetunovir.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/tudopofufifudibusus.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/lezedapibur.pdfIn PDF document text
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/dcdf70fb0856aa3.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/zatipigomelipalozi.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/piloredurotad_powusegezebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tametawoga.rf.gd/simple_and_complete_subject_and_predicate_worksheets.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/peugeot_android_auto_compatible_phones.pdfIn PDF document text
    • http://bozalusi.epizy.com/adaalat_episode_53_mp4.pdfIn PDF document text
    • http://zopefunexot.epizy.com/38950222594.pdfIn PDF document text
    • http://kifozelig.epizy.com/zafuforeminoxenum.pdfIn PDF document text
    • http://jekedizineropo.rf.gd/zuwewudozuvekuxedewepi.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 5684 bytes
SHA-256: 5ec1cf859b2815f915791ec299fc520035df3b3d97b8c5e184297d6bbf1d3e54
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 15456 bytes
SHA-256: eb9859bd61f77f198005857096d5f2701781765ff4a50953210ab22806cc6dc8
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 16060 bytes
SHA-256: eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df