Malicious PDF — malware analysis report

Static analysis result for SHA-256 b187f0900863bb4b…

MALICIOUS

PDF

66.1 KB Created: 2021-03-24 04:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 487566cfe70f61be20fc447a2a6a3eff SHA-1: 375de5f5d496aa126d464649f3eb9d38803af700 SHA-256: b187f0900863bb4b18157d4d194423a37ac1ded26a73a3eb0f35ec774c7b426f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host malicious content or phishing pages. The presence of external URIs and the overall structure suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://golowaki.ru/strik?utm_term=briggs+and+stratton+450+series+user+manual PDF link annotation
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/a49e26b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_602e3ac6d02af.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/4327335.pdfIn PDF document text
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/dagedefoso-gikokitapo-matozesevi-bifoz.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/5952453.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/sukaroxixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_60494ba32f336.pdfIn PDF document text
    • http://xoriruviridov.22web.org/revumozesuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fdc4feb5123e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejesigivilowen.rf.gd/how_to_link_dish_remote_with_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacb516b-dc07-4ac4-938c-3d7066517556/jodowulevarowovelu.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/39602657813.pdfIn PDF document text
    • http://judutuv.epizy.com/how_to_hook_up_rca_surround_sound_to_lg_tv.pdfIn PDF document text
    • http://burefuwuterawuz.epizy.com/class_3_cavity_preparation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab987be2-76cb-4c85-9260-3f5fe88f77c4/lofijubuvumesibobuzoxomol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd11a72-23b1-46eb-8131-2e1b56c2365c/60353413846.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/75877675648.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/wekatixezunowitoxesin.pdfIn PDF document text
    • http://rugekobiga.rf.gd/beaumarchais_le_barbier_de_sville.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 5548 bytes
SHA-256: d187bfe35b93aeb690e7eaee2d35c327d5c36b6b75768f8d36a80fc0eaf6e946
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10348 bytes
SHA-256: 47ee31f6387c83a7e79748e98fa3ba5d1fefbbd4b8f8bce4fabfc3c33368a6a1

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