Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a8dac19e926ec3…

MALICIOUS

PDF

73.8 KB Created: 2020-11-19 03:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 909b30b7bd5767a18ccaaf57386fe938 SHA-1: 7bce814e5a366efedb590b0fedaff078157338da SHA-256: b1a8dac19e926ec3f948e460d62542f1da9b591b289630236b48031db212753a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting critical heuristic firings for linking to known malicious redirector infrastructure and acting as a link farm. The embedded URLs, such as 'https://ggtraff.ru/123?utm_term=liquid+glass+auto+polish+replacement', are likely used to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=liquid+glass+auto+polish+replacement In PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/wopevoza.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/8424483.pdfIn PDF document text
    • https://xezepumufemab.weebly.com/uploads/1/3/4/5/134589658/vusado_foziwi_luzubenafaje_nemulato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_5fada78647925.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/logenovetimo-vofeguvofujubi-wigebepepifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5fb3c888382ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e63924-04c6-4e54-9571-08f7519b8829/28056490825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35919fff-b988-400b-a6bd-d319832fc3f4/xeravew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4c012e-a711-413a-a2e6-8ca7b720bf91/23231364702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98a0efb-0463-44e1-94bb-58e005a2d6ae/zuwamenajapodobekuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba53768-9a20-42af-aeef-acc8612a3c2a/divazumapotaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91d0b66-9b86-41c7-b51e-2e3e37bf0be7/ariana_grande_dangerous_woman_album.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/dawifijaperosapefotijam.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/zukigixavawa.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/ledun.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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 5552 bytes
SHA-256: f91b5a9a7083f77f431a2b339e4eb7f57c05bd5aebb5206f5a168758c7b29ab8
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 9860 bytes
SHA-256: a4a41fb1132871a12e4ca58b525f93a9710bcaf38a355d61edbfe871ed5a2811