Malicious PDF — malware analysis report

Static analysis result for SHA-256 a315d6059613b1af…

MALICIOUS

PDF

73.3 KB Created: 2020-12-25 00:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33291b2842d3a69b7810f5c6ec2cb12f SHA-1: d0a37a204cb5869a05c45e06724aebab78390f5e SHA-256: a315d6059613b1af468f771734412255ffb0cc6e6468301cdd2db2046e8b854d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to Excel formulas, suggesting a lure to disguise the malicious intent. The presence of numerous external links indicates an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=formule+pour+calculer+pourcentage+sur+excel
    • https://cdn-cms.f-static.net/uploads/4478123/normal_5fd67289d5886.pdf
    • https://static.s123-cdn-static.com/uploads/4500878/normal_5fe0e2ff4f45b.pdf
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fbde4e2f240a.pdf
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fa3b1ff58ea9.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdf
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5fdbc6d5859a5.pdf
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fb9f1258408a.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f9eed589eec8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2203e3f5-44de-4382-a1ab-fe139700a10f/safe_room_door_ideas.pdf
    • https://uploads.strikinglycdn.com/files/4551ee4e-0505-4332-8c15-6f0086614368/got_this_feeling_lyrics_em_rossi.pdf
    • https://uploads.strikinglycdn.com/files/528a0949-0647-4a08-813b-dbab2b3b9d3f/nomovox.pdf
    • https://uploads.strikinglycdn.com/files/922797f9-b6ac-4b56-92c9-0c341cfb36b4/iron_golem_dark_souls_cheese.pdf
    • https://uploads.strikinglycdn.com/files/9b849fbb-0430-45e4-994e-16e0763d67d1/26869293011.pdf
    • https://uploads.strikinglycdn.com/files/09ad2f76-d32c-4dbd-82af-c6230df8692e/nemubujopatifukesulipem.pdf
    • https://uploads.strikinglycdn.com/files/68dd86f4-8fbc-4fb7-b10c-667359d3ec17/2002_chevy_impala_engine_diagram_manual.pdf
    • https://s3.amazonaws.com/samopakamefap/rec_screen_recorder_apk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda1.bin
7bcfff42aeaedf66fe5e1e2c929c292f46eb85197406ceb5679dcbe37ab6d833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 5276 bytes
font_01_sfnt_off0000ef87.bin
b261832213749a2e2aa0a35c9e6b2458a8b0753b724a376deec649196d60ea2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 12340 bytes

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