Malicious PDF — malware analysis report

Static analysis result for SHA-256 955fe945d24494dd…

MALICIOUS

PDF

79.4 KB Created: 2020-11-24 22:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb58f1fd7547b052f15af6cb907d88f6 SHA-1: 75429fe10891eb3fa390ba656ead3578a1bddb84 SHA-256: 955fe945d24494dd6fdeb7d7c2d2596ab6cd6f01658585f7c6b293bf723c97a8
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to other PDFs. The primary URL, trafftec.ru, is likely used for phishing or to host a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan. The embedded links suggest a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=euroflex+monster+steam+booster+instructions
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5f979457d6967.pdf
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5fb8f23839986.pdf
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5faaf1313e4ca.pdf
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5fa294045ae52.pdf
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/7459734.pdf
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f97905709804.pdf
    • https://ketovezuv.weebly.com/uploads/1/3/4/4/134454878/1996405.pdf
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fae2b6c55ff4.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05c1a363-5e67-4c8d-9177-33f60a54abf1/28370832831.pdf
    • https://s3.amazonaws.com/rimejiguvif/baroque_architecture_book.pdf
    • https://s3.amazonaws.com/debamijizozexo/jio_mobile_ka_video_calling.pdf
    • https://uploads.strikinglycdn.com/files/7556a5d5-aa90-40d4-b4be-c1851ca282ff/bitcoin_miner_free_apk.pdf
    • https://s3.amazonaws.com/pibajuwi/1223615306.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_off0000eed5.bin
3f25fe266924666aa6ab457b9ee989115ed38a65222cd870553bbd68a3c2a59c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 1956 bytes
font_01_sfnt_off0000f7e4.bin
51c58ae0bad5fbd4747a10c7e79640d5a2416dbc484ef1c268faf242ca3dea49
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 5192 bytes
font_02_sfnt_off0001097e.bin
3c21e03360515e72d7cf4345d8de52991c48d9dd5d4696d88cb905db1d1e608f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 11424 bytes