Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea173b51bcbfe9e6…

MALICIOUS

PDF

86.4 KB Created: 2021-05-12 21:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 30e462d485f5b7f7dbe69ce86f4b40a3 SHA-1: d792d026be58cf6d91cf74eab697a1e827746a56 SHA-256: ea173b51bcbfe9e6ae93473ed99062cc6915c2c2e0c306c50365aa6f1d7d7666
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/strik?utm_term=how+to+connect+scarlett+solo+to+monitors PDF link annotation
    • http://kawibijew.22web.org/fumupesenitasimatatakadov.pdfIn PDF document text
    • https://dogusomuribe.weebly.com/uploads/1/3/0/8/130814063/2941616.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/8194823.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/2216964.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/wuluwo.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/meveruw.pdfIn PDF document text
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/2357184.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/xedewofuretujo/harry_potter_quiz_house_and_patronus.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/bandura_personality_theory.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_4317a6591b0543ab9a380e101f622c97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4b8476-ac6b-4ffc-95cf-64dda8cf75d7/losin_it_1983_full_movie_online.pdfIn PDF document text
    • http://xovajiw.rf.gd/81273963290.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_af44cd671e4c432da91daeed105316d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7216349e-c77e-4795-8d4e-626fb5fadf18/husqvarna_450e_rancher_reviews.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_150191e143c141dfb40ba44115876c16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/blackmart_latest_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40779eee-95e8-4476-9904-517196f5703e/85318515177.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/t_sql_tutorial_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/ugandan_passport_application_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/alone_boy_4k_wallpaper.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_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 4996 bytes
SHA-256: b98a8a66147a4ebdd5bf1ee23be0fd33e3fd25a7693f9c9b1ade8635f8c3751b
font_01_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 12528 bytes
SHA-256: 180920d7fe6db938f24ce98750d9755e1a132bc374e35924cdffa43a5e8e1e72