Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e76e2753d6f3d63…

MALICIOUS

PDF

71.8 KB Created: 2020-12-30 02:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5e0b456b65ee5190b71bc805791fc674 SHA-1: ec6ce8598fd017c4562e94bcfa9bd1e9201bcbb7 SHA-256: 4e76e2753d6f3d63683c8baff9ccf193a51b7b71e16dd3904eccc2b202bcb7b3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to a puzzle book, likely a lure to entice users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffnew.ru/strik?utm_term=onnect+pair+matching+puzzle+book PDF link annotation
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/085433e8e464fd3.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/hhijjZ6/rc_car_parking_2_2020.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/4040610.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/mojuduliwefagud.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/42cba8d8f71c.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/ihibgdn/18870899174.pdfIn PDF document text
    • https://karojigulad.weebly.com/uploads/1/3/4/6/134623473/6220133.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/4ad48326-3fc5-49fb-8692-4574de4bf8fa/sefelir.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/losubinuworaxabokof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3fd399-b644-48db-a159-a1a1dcd5cade/4331166400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ca8763-01eb-4e31-892c-f721d6ee4822/42505744585.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/annexure_e1.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/android_activity_label_center.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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 5448 bytes
SHA-256: 481c8ccb45bd5fd7a9db8af8f0ec92a87753ca912589e4560448c5f4fda61e92
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 11492 bytes
SHA-256: 118658d4de2e7f58a7cce35d124cf206897868d6f6faa04b36a0467a10d1224b

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