Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdc932cdcd291b9…

MALICIOUS

PDF

66.8 KB Created: 2020-12-22 18:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 310b21f559368bc6b5fc38034c32c097 SHA-1: 4787946dd613cfee9797d0a5d73d39b85b6a625b SHA-256: 0bdc932cdcd291b953fed77373a994c08c7a5441cec9685db25b89974e574c20
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links, 'https://trafficel.ru/123?utm_term=everstar+mpn1-11cr-bb4+reviews', is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://trafficel.ru/123?utm_term=everstar+mpn1-11cr-bb4+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5fa2d0b42ba90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fcbf25615034.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/d4c63f1dc8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5f94423eae07d.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/fed03799-4427-4d9a-9cee-9221da9e197b/60291731265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b95c331-8c5e-4089-91e8-36005f88d9c2/82494325556.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/didewulupesitupupogekivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed25f009-b403-4d5c-be39-86827b5e51e2/per_our_conversation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a9bd57-4953-4338-8764-116cbbe2c53d/abbyy_finereader_15_magnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d24781-3395-46b6-9b76-77d8baacaa0e/92476913419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b6d11e-81ef-4103-be0f-184c453d306c/22315261495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf99201-433b-4721-807e-efcba59e7337/66164462190.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/80410156557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c590d1b-645b-4b36-af95-32c7a7b9f6dc/51607102576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b9fb19-4c01-4c9c-a28d-b2945f4e300f/50648668941.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_off0000c49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49B 5468 bytes
SHA-256: ac4d6b2037ddca7cc60006439ea7891dba0568e0900cd69786ca66ee545dd815
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 11656 bytes
SHA-256: 54d861bea1ae202673c9bdab61132c5f102c1622f93ae1092efa476bc04543bb

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