Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fd210ad0a78ed0…

MALICIOUS

PDF

68.2 KB Created: 2020-12-13 13:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 27a9c0fe57681073e0e4351e72589c62 SHA-1: dec507dd34908afe1a4857f59cf46093d8c412ee SHA-256: 31fd210ad0a78ed0a10e607c6b76b1da84d0cd956e6f1b3d8dc04e7b6eda88ed
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/aws?utm_term=tamilrockers+2019+tamil+movies+free++hd PDF link annotation
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/5734758.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/tubapam.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/79665f3ff0a7.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/gazisuv.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/6621962.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/babuxufarizuxur/dimibupidosotem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f06dd4-695a-4dcb-b327-1f88bbe3bb86/bujopap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db9c477-5589-48b8-b537-bda52b4267a2/heart_rate_cancer_symptoms.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54698085bf90c0e1a01e1/t/5fd6003d034a586a4f3926a3/1607860286267/brandon_grotesque_bold_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1abb76-2ee0-48b6-8d02-664cefdcae0c/bolanigoxixatasuje.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_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 5816 bytes
SHA-256: cb2ca06b61f3b2682e5ad84e4405e93bdf9aad0e7bf9676cb2cf624426a2471c
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 1936 bytes
SHA-256: 19d579821e83c32cd478aefcb57f849508ece8625c42f2108810477b29a00d2f
font_02_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 11228 bytes
SHA-256: 0eae6d11cfa8b9e4412eb81898d1c8d2099e6aebe673fec2dd2b454f08d9e095

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