Malicious PDF — malware analysis report

Static analysis result for SHA-256 489c24f56dce2772…

MALICIOUS

PDF

75.3 KB Created: 2020-12-16 09:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 61f81d3a592ec35d44d7b4514df79da5 SHA-1: 92e1c52763faf4a4d61583f627fe4c959f5b1a83 SHA-256: 489c24f56dce27726af2bd3b95274b1b05b065261c4927def65ee3b228921c4e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these links, 'https://traffnew.ru/123?utm_term=cormac+mccarthy+writing+sample', is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

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 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.
  • 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://traffnew.ru/123?utm_term=cormac+mccarthy+writing+sample PDF link annotation
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/bajiwusikumiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5fc096f6591a7.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/34612d8315b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/driver_genius_pro_18.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2bd98403f5353fda1b0ca/t/5fce33922fa8bc6bcd13be40/1607349139621/penguin_isle_mod_apk_1._25._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adaedb09-9b2c-4054-adf8-a7d6c89212aa/its_a_girl_thing_woodbury.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/62333314478.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00c29085bf90c0ef85582/t/5fcb7153da45e86ccaa3914f/1607168339411/vh1_roku_app_not_working.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce79424981a0308257053f/t/5fd5f519ffab5d3c56ef1651/1607857434031/76970252888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fd77ce-8671-4246-b0a2-f4c0d4c4c56a/56464862561.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf44e5c7695ca99b2c1d/t/5fc12d3d7acac6192aeb4444/1606495549818/19053189551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b048e57d-766c-4ea8-955b-65268f4dd408/49370291745.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 5448 bytes
SHA-256: ce1464161bd27e5fd87949064ded735bf96f046e211a84edcc993391b56e64ed
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 11004 bytes
SHA-256: 67828d7a94f15a00b1004d5f420ee36ad0bb1c257a1558e3622985b4757a6ceb

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