Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb8a94c19c1487c…

MALICIOUS

PDF

59.4 KB Created: 2020-12-02 11:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c565af6a1e758ed908b02ddc41383ec SHA-1: 77a02cd33243f315b858c5312ea10f4593694155 SHA-256: beb8a94c19c1487cf712f10b664c349abf2f24e162d7d4e5a96f794f872c32c5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a potential link farm. One of the embedded URLs, 'https://trafficel.ru/strik?utm_term=plate+tectonics+answer+key+readworks', is suspicious. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious content or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=plate+tectonics+answer+key+readworks
    • https://bopatixenokukab.weebly.com/uploads/1/3/4/8/134873261/9c42bbbb1c.pdf
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/vodumalupelakeg-balefavanixomaf-laxumoxetitab.pdf
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/sariv.pdf
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/dowixipadutume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxadelefofibuz/13836545257.pdf
    • https://s3.amazonaws.com/divexikav/wuzosojitageziba.pdf
    • https://s3.amazonaws.com/bitizopovopaso/90247177570.pdf
    • https://s3.amazonaws.com/gavobawum/vujewezovof.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/kupeligulogikivetedut.pdf
    • https://s3.amazonaws.com/gedesisumi/tapir.pdf
    • https://uploads.strikinglycdn.com/files/83087eec-037f-4bd6-958a-58b596236ef5/where_the_heart_is_apk.pdf
    • https://uploads.strikinglycdn.com/files/431fc193-4a50-432d-b4f0-755257d55106/intel_centrino_wireless_n_1030.pdf
    • https://s3.amazonaws.com/jipowumat/pavalelajubeleb.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/womibup.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_off0000ad7f.bin
28d779d7679246f04d7872df8a39c07551259504d8650abe98756c253201dedc
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 5192 bytes
font_01_sfnt_off0000bf4e.bin
bb316a5531ba51f9c48d278a85573cc1230871ef34aab63351a945d18a77278b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4E 10240 bytes