Malicious PDF — malware analysis report

Static analysis result for SHA-256 749e55b6157f4fe3…

MALICIOUS

PDF

74.6 KB Created: 2020-11-22 21:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 38268c7a87427821028325a992bc9022 SHA-1: 2494ab6ee819b846981d6a8cd2883bd54533ae84 SHA-256: 749e55b6157f4fe32bf5ad95636289cd6cb6cc50279b8ded8ec4d9df6efe0720
156 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 0.9998

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://trafffi.ru/aws?utm_term=cryptography+ebook+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5fb8a931b7894.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/821868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8bcc4e9762c.pdfIn PDF document text
    • https://jegolufu.weebly.com/uploads/1/3/4/6/134677495/tusozawo.pdfIn PDF document text
    • http://qvault.ioQuantumIn 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/bc2aafb3-6697-43f1-871d-a9e2082873bb/33001101161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9974885-fc64-4455-a63f-12522d831f17/34362122378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b9f09f-45b3-4179-85b0-069ad49eee27/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1476f9cc-b985-48f2-95f4-180add443c2c/birabanuripuwalekunapimap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f70817-78ab-4f18-b4cb-ecc86b9238af/may_2009_calendar_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848aff0f-0168-4d77-9c4b-816658039ac7/dillards_return_policy_clearance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d1849a-4e92-4cfa-bd01-8f5857144635/super_singer_vote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e14446-0105-437e-b554-53173946fb08/borderlands_the_pre_sequel_classes_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763eb527-ccfd-41b2-8949-8d010b207b26/suzuzetexuzopibevogepuz.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010115.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10115 18364 bytes
SHA-256: 02f3aec4f0ad1a9ce328a5fe11a30aa7be0b0b127d237acd21289939fb90a161
font_00_sfnt_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 5164 bytes
SHA-256: 97794c74ed1c38fb9ba3b31d6740637d691154ef6a0e285a7767ef678d99cf1a
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10924 bytes
SHA-256: 54d9f4447f4b7bf5b2957bed3dba2a20e5c0033e87bec7aa254013bd46fc5fe6

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