Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cc58874b31e21d…

MALICIOUS

PDF

87.6 KB Created: 2021-03-31 07:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cf9bc627a9d6c5c5fdf9b86aca0fbcd8 SHA-1: ce3319a6132f778676edc7b066dce373103d26a3 SHA-256: d6cc58874b31e21da3e32b1114e66958a3daea19386a21f5f49823882e2c7450
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

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://xezojetit.ru/strik?utm_term=ariens+520+snowblower+how+to+start PDF link annotation
    • https://bovimifukid.weebly.com/uploads/1/3/4/8/134882826/powesafi-jefuxadol-gidadabozokon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_6047a62713010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_604ad34057291.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/38789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_604df294e48eb.pdfIn PDF document text
    • http://wazasoku.iblogger.org/how_to_charge_sony_icd-px470.pdfIn PDF document text
    • http://mojukoxazepiku.iblogger.org/korean_learning_books_for_beginners.pdfIn PDF document text
    • http://mivibowefumar.iblogger.org/why_is_my_laptop_battery_light_flashing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidogip.epizy.com/4349070078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8857a03d-2766-4417-8a73-76b9d762f0b9/craftsman_1_2_hp_garage_door_opener_logic_board.pdfIn PDF document text
    • http://vepilezora.epizy.com/50835017357.pdfIn PDF document text
    • http://jamasuneli.epizy.com/bass_guitar_chords_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4d3bf1-f4f2-425b-a9e1-e95f3c26abe9/what_111_means_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1559e66e-13d0-4f28-b7c1-094d8f4c9fd3/pepiwiruzobu.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/fubodomevikefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b090af89-ce21-4137-8e1a-862cf7873f77/benemerefabedeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/drastic_ds_emulator_cracked_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b5108b-e281-4ae1-9751-97cae0b64c21/76510872829.pdfIn PDF document text
    • http://rejoxon.rf.gd/how_caffeine_affects_the_body.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_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 5392 bytes
SHA-256: 63c5b85ef9059589601bf7bccf58ade555c1fca925d895e7749b8eb696f4832e
font_01_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 11852 bytes
SHA-256: b2d9360452fefb55db39fcbfc842a0a32167068077d5ba9e5ce3d620f1cf7437

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