Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bb14b931d9e712…

MALICIOUS

PDF

61.3 KB Created: 2020-12-22 20:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8c3dea58b2e46b001123493393e2048e SHA-1: 930305a10a177f31146a15ebd7bd4c2bab9e7b65 SHA-256: a9bb14b931d9e7124a74bcdb00723d1cd55a894990d0586b3da8001443d65448
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafficel.ru/aws?utm_term=holt+elements+of+literature+world+literature+answers PDF link annotation
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/6562954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fa4612109477.pdfIn PDF document text
    • https://tofapugorod.weebly.com/uploads/1/3/4/8/134885187/kuraka.pdfIn PDF document text
    • https://razulusajo.weebly.com/uploads/1/3/4/4/134467314/1951329.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/dojuxuk.pdfIn PDF document text
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/fuzigabuvelanidedif.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/jamuluvuvava/lidutediluw.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/cannon_training_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/download_grand_theft_auto_san_andreas_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ca47ab79f442f24277df/t/5fd6fd4072b1137fa98bda5d/1607925070978/juniper_ex_switches_configuration_guide.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_off0000a813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA813 4988 bytes
SHA-256: 48f628122b25e2a2852ac177215f6d6228d3797c3a4d52462ab1454a05884ce8
font_01_sfnt_off0000b8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F4 9844 bytes
SHA-256: b23bb35ecc0ec5d3213290ebf99d9732151cea8005c0b8d7f3cfe6de1fab046e
font_02_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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