Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb15b8aec7874172…

MALICIOUS

PDF

67.6 KB Created: 2021-02-20 04:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d2aa4f19a592126b12f3268f7d194897 SHA-1: 49fe453600500b4ab51d687f7af84d805f99afd0 SHA-256: bb15b8aec7874172c6d04b243719b4f449062c24af396a91d6b699db0d34a7b2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF files, likely serving as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=elite+platinum+5.5+qt+air+fryer+reviews PDF link annotation
    • https://cdn.sqhk.co/zeboxuze/q2NXgjI/stickman_fight_dragon_ball_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/heicqmo/heavy_industries_calgary.pdfIn PDF document text
    • https://fudolimag.weebly.com/uploads/1/3/4/5/134586879/5989889.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/hifVigC/waxisewofixag.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/bNZjc6L/woodshop_projects_for_middle_school_students.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/ihajejj/zen_koi_2_patterns.pdfIn PDF document text
    • https://xulijuba.weebly.com/uploads/1/3/1/1/131164032/tofukokuxasonu-jisarimatezojef-nuxuguzarusuxi.pdfIn PDF document text
    • http://damita.fun/labepagaketuropezidiuuzwt.pdfIn PDF document text
    • https://wipibafupegivu.weebly.com/uploads/1/3/4/8/134868488/vesunateviboke_rebafizal.pdfIn PDF document text
    • http://santecmb-sarl.com/advertising_agency_around_metro_manila2xtwb.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/gnjezid/domofozujolevufadageko.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/hGgggiQ/real_city_drift_mod_apk_unlimited_money.pdfIn PDF document text
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/gifipebazepidub-ximudafazini.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/5jg55uT/learn_python_3_the_hard_way_latest_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/haQXqhc/bubble_shooter_classic_online_play.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/fugopuzawero-leravefiwi.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/rajanumanoje.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/48167361488er2v1.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/pekupet.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/76e622c45f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 5540 bytes
SHA-256: 77417f6b1b1575d68010bc9812fe3f6ffcf04cdd02899f0723c9b2509150f241
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 10300 bytes
SHA-256: 2a9daa6cbb802dd3204551063b2025bc90b819400ec0950a43b2ce56c39da026

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