Malicious PDF — malware analysis report

Static analysis result for SHA-256 a821473dc36bbdd3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-19 13:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1c3b433c2c1e8cc75a701f9f1c7730bd SHA-1: e1dc001f53cff6ff6a2fa80fa911368d548dcc2d SHA-256: a821473dc36bbdd332668f1a5fccd34354ce99d62421196dcb15c0e36646ff0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing lure.

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://seumenha.ru/strik?utm_term=acer+h233h+monitor+price PDF link annotation
    • http://busimaderule.mywebcommunity.org/givigefipujimajowovo.pdfIn PDF document text
    • http://efarbok.xyz/64680048251lg3je.pdfIn PDF document text
    • http://simultaneously.space/9252080799361aof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_60417c7397f33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455902/normal_6007a9aadc0e0.pdfIn PDF document text
    • http://shlifovka-pol.website/ropekituvi8mze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_601e2bbfa79ad.pdfIn PDF document text
    • http://gnfcns.info/death_note_movie_2020b7tqj.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/40507863958.pdfIn PDF document text
    • http://fitokaps.xyz/wokaxolarinufekoriwedkk4y0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_602471c34f7bd.pdfIn PDF document text
    • http://depusapo.mypressonline.com/stadtplan_berlin_bvg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_60013e07bae8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f703d75-7bb3-4546-b156-bf20a28d51f6/how_many_lives_can_a_person_live.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_648eba1d17224e1c90a9da9349d5c96b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5a1a25-6487-45b0-8015-28482104207f/rikalokojijutozolosu.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/microsoft_senior_program_manager_interview_questions.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_05d6c7bf770544c89019cc8eaec25777.pdf?index=trueIn PDF document text
    • http://zujisofivo.onlinewebshop.net/bunubotifosibe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 5036 bytes
SHA-256: 92a64e73bd0133a2241c3399a6a89fb53be272bbb3f4de87440667f6220f430b
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10552 bytes
SHA-256: 6a61fe1f8f9f6e2543598e79c23709b3192ddb4533bfa55d73a3994fd1262d72
font_02_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

Open this report in the interactive analyzer, or submit your own file for analysis.