Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e54b5208fa20d9…

MALICIOUS

PDF

72.4 KB Created: 2020-12-19 18:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e7cda3fca3c30e1cdba7d184870ea3b SHA-1: 18794c106b75dbb5f84e96b0bfde72c36c0cfae0 SHA-256: f1e54b5208fa20d915c8b99aa81ff33480edab936dbdd232cc460ba63e508335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to Weebly and S3-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://trafficel.ru/aws?utm_term=gigabyte+z390+aorus+pro+wifi+manual
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/folanofidebisokap.pdf
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/6311305.pdf
    • https://didunebufanef.weebly.com/uploads/1/3/4/6/134680758/3640759.pdf
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/figozu.pdf
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/8281129.pdf
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/90314c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tapelu/bingo_card_template_in_excel.pdf
    • https://s3.amazonaws.com/supefujoxopubu/lowekake.pdf
    • https://uploads.strikinglycdn.com/files/681216b4-38ba-4a7f-8456-5a23a2e2fac3/davedeloluzubofan.pdf
    • https://s3.amazonaws.com/risisipajole/86160828134.pdf
    • https://s3.amazonaws.com/loxopudizus/multiply_a_doll_2_kongregate.pdf
    • https://uploads.strikinglycdn.com/files/c3e9c22b-6ebd-4e65-afd3-46fced82428d/free_nes_elementary_subtest_1_study_guide.pdf
    • https://s3.amazonaws.com/warapagefasovi/vinajibuwawigubulowulab.pdf
    • https://s3.amazonaws.com/bejeseja/72525338828.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a8.bin
9e8f68341003e4ace2a3e4dbb1e6e53a645f686b429d45fd147c9ce8bf46e59a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 6096 bytes
font_01_sfnt_off0000eb76.bin
a329dbabe611da468e725041dfc09d5a3aa71278283cc823ea70949bbef98fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 13344 bytes