Malicious PDF — malware analysis report

Static analysis result for SHA-256 385c5a2203d97e80…

MALICIOUS

PDF

75.8 KB Created: 2020-11-10 09:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360990ff0bc6f89548144837e7d6ed74 SHA-1: 7978135a96cb5ee4eefcf3e65c54b05c39be12af SHA-256: 385c5a2203d97e801d274df279394a0f9dbfb535df7e9b68689f8ff668b3c7b6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. This suggests the document's purpose is to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?keyword=illusions+of+grandeur+fanfic
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8a4bf572bab.pdf
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/sifep.pdf
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/2284865.pdf
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f901042396ee.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f89f89f5213b.pdf
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5fa4a2c9e2243.pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5f90f3cdb0d92.pdf
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f9fe5988e322.pdf
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/eca0e0ec780404f.pdf
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/cf8ca689e.pdf
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/fogixulabuzim_wemed_kezuxukururer.pdf
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/rifikirorotomaj.pdf
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5f9b756f7b5f1.pdf
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/225f86e.pdf
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/86ceba2961fe8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/061fc5af-3bc7-4741-b2ff-ee9a01028b52/92618365248.pdf
    • https://uploads.strikinglycdn.com/files/72d1d581-80e9-4a23-b96b-ec54643e10a9/tawukenukitaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a6.bin
6b42c87740809aaa932acbc3377014b2c4ad3079a60c5e9d1b258a1c97f4fea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 4928 bytes
font_01_sfnt_off0000f267.bin
cf8d850040a14e897efe0ff693027878368eaf54779507d81dae935408f08e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 9752 bytes
font_02_sfnt_off000113a1.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 4324 bytes

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