Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbadea824bd91e6…

MALICIOUS

PDF

81.8 KB Created: 2020-11-13 22:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33e19e3ff97a745ee20f3b7848d7ad0 SHA-1: 6894686999da0c9600cf55a421ecd9eec2a5055a SHA-256: 5cbadea824bd91e6c984dddd3fc6cc1a50038c5287c13eab143dbde74df83b93
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=west+springfield+high+school+sports+hall+of+fame', is likely part of this scheme to drive traffic to potentially malicious or phishing 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://trafficel.ru/123?utm_term=west+springfield+high+school+sports+hall+of+fame
    • https://vilekelapufixev.weebly.com/uploads/1/3/4/5/134508089/015333ad261a8ed.pdf
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/7729218.pdf
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/4965843.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/2658506.pdf
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/jinosojazedatune.pdf
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/nojanuwetutawop_jujuxedutetiro_wufika.pdf
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/4500252.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/xonojotelufiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/99f07fbe-bd9b-4fd9-9b6a-4490c347f039/lazulagetomidi.pdf
    • https://uploads.strikinglycdn.com/files/ad291e69-0823-425a-96d4-49c5158ddd46/vurevulal.pdf
    • https://s3.amazonaws.com/vogubivajavofu/sift_heads_ultimatum_hacked.pdf
    • https://uploads.strikinglycdn.com/files/51879118-813f-43de-832b-f95732b55d78/nesebukeboniv.pdf
    • https://uploads.strikinglycdn.com/files/7e0e7e3b-aa5e-4d68-90f1-7d46b6c44fc9/teach_yourself_cs_a_diy_curriculum_reddit.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_off00010345.bin
adfa6a0fdbcd1ab650199d8baa8ca4160192c48eeb70bc0fd12f7a987586e99b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 5580 bytes
font_01_sfnt_off00011628.bin
fb6a4c8f3eef6a6334595afd67cd7d5c12962bebf63346bd2b4e94cef8e14dec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 10600 bytes