Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b4d8a7b9d4cb79…

MALICIOUS

PDF

72.9 KB Created: 2021-03-30 08:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f8f9a137feac97e13d3a211d177cc0aa SHA-1: 9cb6bbfdd347990ed807d1e5be682f5a871a8c3c SHA-256: 49b4d8a7b9d4cb7928cd2ea8cb540fcb8d7d59e6f0c40e60aa5d189b5ae1a2e8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=salter+disc+electronic+kitchen+scale+manual PDF link annotation
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/6b19b04ea43.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/ifUTXN9/tujuxinunax.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/gfhiZic/monster_preschool_craft.pdfIn PDF document text
    • http://icub.tech/gezugusg3l0y.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/hdighf0/37568653847.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/hcijZjh/bucket_list_movie_coffee_name.pdfIn PDF document text
    • https://tibikinadip.weebly.com/uploads/1/3/1/8/131856726/kexoxevosubu-nuvaser-luvujelalov.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/W5sghhd/10174298471.pdfIn PDF document text
    • https://cdn.sqhk.co/sesedazaw/jT7BWwV/flickr_pro_smugmug_discount.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/cgj30jf/tiktok_ban_update_news.pdfIn PDF document text
    • http://bathforlegs.xyz/51601957090fyc3t.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/bAgcF47/top_marketing_firms_to_work_for.pdfIn PDF document text
    • http://pumba-timon.space/bosch_vp44_repair_manualmj6kr.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/e7cf5305b.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/luworizesupox/34978797147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516476c4-afe2-45f9-a3e9-51f3a7708995/esky_antenna_website.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/zojek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156ba29c-de4e-4b26-b987-ccf2503dea75/hampton_bay_ceiling_fan_remote_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c73c9bf-3988-4b4d-8a98-6bada454bfe8/samutosigipojolemetunarut.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/xitivedisipanekajujakimed.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/91660329771.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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 5344 bytes
SHA-256: e36cbed8acad75a98a49a17247eb29c01f775c4c43a4db78cebdbad8ac74c304
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 11068 bytes
SHA-256: 3d576ca4dcf0d3f2e3ff4505fc94c69f2b09f1d94c41a5e79d0dd3acb25e1ca2