Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eea73ddd7ddfae…

MALICIOUS

PDF

76.0 KB Created: 2021-04-22 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aa55f93547204a6a2ff5ce4be2de564 SHA-1: 21e414b824c8a135def24d6d4c7c4befc25ad9b9 SHA-256: 21eea73ddd7ddfaef3928d6c18d38b94607d23e32aa32e4dbe80fca58800280a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it functions as a link farm or a phishing lure, directing users to potentially harmful websites like 'golowaki.ru'. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/strik?utm_term=how+can+i+live+a+peaceful+life+with+god PDF link annotation
    • https://cdn.sqhk.co/tibidimewako/gid4ieG/61388488576.pdfIn PDF document text
    • http://yognat.space/organic_chemistry_klein_3rd_edition_solutionsx5dl9.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/e2f829ba.pdfIn PDF document text
    • https://tipurovus.weebly.com/uploads/1/3/2/7/132741110/16575067ef2a319.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/iiieyGW/16005172478.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/YIhbhgn/53980567171.pdfIn PDF document text
    • http://polfact.site/balloon_defense_5_hacked52mpo.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/02f702f4-fa75-4188-85b0-4559b82bd857/trx_workout_video_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e75bf5-a9e2-4507-9033-1ccd6e14ce82/32818514453.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_bf6866baef284d00919fb55644e93ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/2017_chevy_cruze_hatchback_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/twilight_full_movie_hindi_dubbed_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/winchester_model_1200_serial_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/degotabuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34695a6e-8bf0-45dd-af3e-0e5e74b52e66/garmin_g600_flight_simulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f16099-102b-4181-9503-740e694c04d1/lujipatij.pdfIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_245c616a17744e53849c656643b3c0d7.pdf?index=trueIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_551d9b1a72e2461aa648a032a035443c.pdf?index=trueIn 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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 5256 bytes
SHA-256: 959f6b9d54b0c2a69df0291290dac585d0540ca4de09fbe21ae65bb5b150cb3c
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10696 bytes
SHA-256: 17fe49a38d4d8ecfc3bc7c67d3dec1de06b6acf453a8d2fdcf178eeb4dda607c

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