Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d099235b210f881…

MALICIOUS

PDF

75.8 KB Created: 2021-01-11 09:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 713ee0a9a5ab15c20c917f5d12554520 SHA-1: b5650eaae4fb321ec1baeb03931ef3b34aa3d743 SHA-256: 7d099235b210f881d3f8c4fb6ee8b2e1be7283626d043376afa785dfb4e2bb67
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafftec.ru/aws?utm_term=subordinated+debt+equity+on+balance+sheet PDF link annotation
    • https://site-1168332.mozfiles.com/files/1168332/racing_car_traffic_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f9dbb746963d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fe17c741dd7b.pdfIn PDF document text
    • https://site-1176333.mozfiles.com/files/1176333/45207713276.pdfIn PDF document text
    • https://site-1200133.mozfiles.com/files/1200133/85806245255.pdfIn PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/bivakilatawofo.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/680432.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/ce577.pdfIn PDF document text
    • https://site-1178022.mozfiles.com/files/1178022/biodata_resume_format__doc.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
    • https://s3.amazonaws.com/bepukuba/modelo_negra_tap.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/chicago_manual_of_style_for_references.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 5380 bytes
SHA-256: 10c892c6339d0ef5824e4a5812f1e509a83c31d4379f23f226e52e71a318b203
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 10448 bytes
SHA-256: 4ac322ce98bc477de7f68bfeeff8f3d9518285bce9fb0f30c9f283e99f968e4e
font_02_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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