Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1809e9d019590e1…

MALICIOUS

PDF

74.8 KB Created: 2021-01-15 07:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d5c4a1d580a0f6f34df0da07304cbe SHA-1: 7bf1a5f89ea63dee2a7cbba2b14dc8985dc8cd5b SHA-256: e1809e9d019590e1e3f2cdb774a1160edb155ee75cc2178008dedbc3debc00a3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://traffking.ru/123?utm_term=bmw+garage+door+opener+genie', suggests a potential lure related to search terms. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=bmw+garage+door+opener+genie
    • https://cdn.sqhk.co/gufezitaxato/9sggijZ/dragon_city_gameplay.pdf
    • https://denoxexulove.weebly.com/uploads/1/3/4/4/134457588/e8a1bb0e5b38462.pdf
    • https://cdn.sqhk.co/fumamimed/QMNngju/zisexim.pdf
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/31f1327869805.pdf
    • https://zomonuluxerow.weebly.com/uploads/1/3/4/8/134867862/dijifini.pdf
    • https://cdn-cms.f-static.net/uploads/4425919/normal_5fba3d765901b.pdf
    • https://cdn.sqhk.co/mivufarowiwi/6rCZXvi/jumpstart_kindergarten_game_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc938c09912a.pdf
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/kagasep_fesivukor_kesowej.pdf
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5ff5fd5c55695.pdf
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/dc5741ed82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fosawef/vejujemotuwiwigitumekix.pdf
    • https://s3.amazonaws.com/firigugixujotov/heb_cedar_park_center_events.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_off0000da6f.bin
ec0dab966a58da7d244f7348934850ee21cb5744aead275d78e70a5df88d45ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 4920 bytes
font_01_sfnt_off0000eb10.bin
f19b1cb8b4193426725f71d1d0d07277c1049ad36beea52285915603c1a7c203
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10624 bytes
font_02_sfnt_off00010f06.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 4324 bytes