Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6b075aa3a486c8…

MALICIOUS

PDF

70.4 KB Created: 2020-12-07 16:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a74bcc7538154d52bf5c7fdd46393aa SHA-1: d61cd6e10100de4930c802d00c53da2e35644860 SHA-256: 2f6b075aa3a486c83402bfcf7c5ff0257b1c1e7dca04974a87cdb65dc42d536c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to distribute malicious content, with one of the primary URLs being trafffi.ru. The document body, though heavily obfuscated, contains text related to 'free online 6th grade math worksheets', serving as a lure.

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://trafffi.ru/aws?utm_term=free+online+6th+grade+math+worksheets
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/gawubepaza-gakojinumonopal-nidasegi-duzevadoduxex.pdf
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fb99ecd5edc7.pdf
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fc4affa9e0c1.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/zokupodud-gileroduwof-dezifanawemefi-lovoxisapilu.pdf
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/2751166c3838f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/359bdf72-742a-42ae-b89b-1b5cb94970ec/27957135513.pdf
    • https://s3.amazonaws.com/wovitiku/jemiwup.pdf
    • https://uploads.strikinglycdn.com/files/423c01b3-5341-48d9-8ba0-d4034a4a7c93/mubukikutemonifevavujet.pdf
    • https://uploads.strikinglycdn.com/files/c94c0a0e-39ca-4983-9cfb-3597e461e515/register_maikai_card.pdf
    • https://uploads.strikinglycdn.com/files/0e8848ff-0f4d-4e15-b576-93281d41b281/6389452587.pdf
    • https://uploads.strikinglycdn.com/files/5da9ae5f-5493-48ad-92e0-639ee0e697d9/lipuxumumos.pdf
    • https://uploads.strikinglycdn.com/files/ff6da514-0977-43b9-8261-d1762a0d4e89/bachelorette_season_15_episode_11_me.pdf
    • https://uploads.strikinglycdn.com/files/94435b66-410f-4536-adc9-658dece1a1c4/30850122380.pdf
    • https://s3.amazonaws.com/ropidadegaxut/article_370_amendment_bill.pdf
    • https://uploads.strikinglycdn.com/files/5c18b4ac-0a4a-4d24-9e9c-a5479e5febff/frozen_fish_sticks_in_air_fryer.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_off0000d5df.bin
dc1bb9aac14e4dd5a6fd0ea7a6f76e602a5992545f64a4c711e05ad8706b16e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 5504 bytes
font_01_sfnt_off0000e87f.bin
6b40db4840e4d0c337a3c1b44a4415188bde75f08a2e21d0daaae371ba9d4cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 10620 bytes

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