Malicious PDF — malware analysis report

Static analysis result for SHA-256 58498b500b84a3d0…

MALICIOUS

PDF

70.7 KB Created: 2020-12-25 07:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce8caa7013961c37821dd316250106a4 SHA-1: b7da9f91be489539b610538e39dda1c8c1f3abed SHA-256: 58498b500b84a3d08d9fe324a92d973c03aa7caabf2630d64fcc5dfd9a1fcb36
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to direct users to malicious content or exploit kits.

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=physics+regents+review+packet
    • https://cdn.sqhk.co/pakuvesajuwo/hahcJhj/75371350927.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/taporobifimorufik.pdf
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/gurejab_jodadapa_suduzuvumud_xewasekewe.pdf
    • https://cdn.sqhk.co/gozolosew/6ibE4Jj/rujinaduvupiropazojeta.pdf
    • https://cdn.sqhk.co/kuvapipitol/YgjgLwo/that_s_life_mac_miller_lyrics.pdf
    • https://cdn.sqhk.co/sepunaro/geidjap/52785171145.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e86f0df6-ad23-4327-8ea1-ffe1f36010ad/61887487192.pdf
    • https://uploads.strikinglycdn.com/files/94eff760-eef0-4174-b396-c858a3966a95/ap_bio_cladogram_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/01fce152-b83f-488c-8c92-a2a524c87ed4/safafesika.pdf
    • https://uploads.strikinglycdn.com/files/640bb1a7-51b0-40b4-b38c-a952be192f55/41275802145.pdf
    • https://uploads.strikinglycdn.com/files/997eb3bc-2c84-4fc8-a454-2344919f1bce/wisojuzibunixapededapowu.pdf
    • https://uploads.strikinglycdn.com/files/e56949ab-93ea-48df-99ba-9de655b06d42/tafaj.pdf
    • https://uploads.strikinglycdn.com/files/321dd9f5-407b-436c-b24b-6ee4d614e31a/9560238970.pdf
    • https://uploads.strikinglycdn.com/files/a059f874-6bfc-43fd-a0f3-5b5e64571b3b/the_key_to_freedom_poem.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_off0000d809.bin
adc63f9417c00785d6007035d4998c9a2ba4e536b67435ba76431bd4b6322bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 5480 bytes
font_01_sfnt_off0000eac8.bin
0b2dc3836805536c8cf1c5174e214e70001849211a31c14f8b4fb2fb36a2062c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 11160 bytes