Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0caf6a3a0251edc…

MALICIOUS

PDF

72.5 KB Created: 2021-01-18 16:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9a82846a2e37cb7a87b656c24111a48f SHA-1: 5497fbc08050ce04e8f28c7ff0b9b0eb1da7d215 SHA-256: d0caf6a3a0251edc2df420672db10ce51ece9509cd3dc928ab00e83bd579e401
214 Risk Score

Malware Insights

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

The file is identified as malicious due to critical heuristic firings indicating it links to known malicious redirector infrastructure and hosts a large number of external PDF links, many of which are likely SEO spam. The primary malicious URL identified is 'https://ggtraff.ru/aws?utm_term=risk+analysis+pdf'. While no scripts were extracted, the PDF structure itself facilitates the attack by embedding numerous links designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=risk+analysis+pdf In PDF document text
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/92643b3d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fa8a3be1b109.pdfIn PDF document text
    • https://tapevasazizile.weebly.com/uploads/1/3/1/4/131454670/maziminojigupax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fdd692e7059d.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/gLgh5Ky/mobilepay_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/Kljhdhj/rijipilogeratideralu.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/0THzhig/nait_personal_fitness_trainer_courses.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/monifumexoj.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/he8Ijft/2432210837.pdfIn PDF document text
    • http://ketorebagibof.22web.org/mopufeziwogogixaf.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/2ed37ed69f2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luropi/gold_brick_guide_lego_marvel_superheroes.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/jaipuri_print_bed_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/multiskan_ascent_software.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/spiderman_flash_games_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/sa_spelling_test_form_a.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 5112 bytes
SHA-256: 1065d9580fff00837057310bacd4a3fad5e0532832d70e01988c86a003f2d23d
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 9520 bytes
SHA-256: 78f3d61a51ba5dbd1bba51b5cfae92ff6cf6f5e68bba016556409736f5b6557d

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