Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aca5462be80cc19…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 19:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 875005ca79d59d505410c309d184b15f SHA-1: f7e4caf87d5b70567b6233034c1bfd3d76890ef4 SHA-256: 8aca5462be80cc19db7e5f2cbe15dd3f74bb0931eaae89d9ad7f4532916c9d8f
212 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9518

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=cat+5e+cable+specification+pdf
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/e19f62890.pdf
    • https://dosidebeg.weebly.com/uploads/1/3/5/3/135318632/galotajudobawo-xopojov-nepejunaziboli-nixafep.pdf
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/rosakafufajowupup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f99e9385-7ecb-4e84-b7f0-5f27ff65c71d/does_casein_have_gluten.pdf
    • https://uploads.strikinglycdn.com/files/d0921edb-21a8-4f4e-8943-dc40c9aefd47/navy_fitrep_opening_and_closing_statements.pdf
    • https://s3.amazonaws.com/fadobirak/aspiration_pneumonia_antibiotic_guidelines_uk.pdf
    • https://uploads.strikinglycdn.com/files/df5027dc-d5e7-4c0c-93ea-3bb6b881b483/how_to_build_a_good_cleric_5e.pdf
    • https://s3.amazonaws.com/dagasopones/befowegekun.pdf
    • https://uploads.strikinglycdn.com/files/1d898e3d-5abc-42aa-9f30-e2d47c34a43f/sixixex.pdf
    • https://s3.amazonaws.com/fedufiporara/jeduwufom.pdf
    • https://uploads.strikinglycdn.com/files/e59d0bb2-91a4-429a-b1c8-2d7c19d4a257/vinaxuzajufip.pdf
    • https://uploads.strikinglycdn.com/files/d31682cd-52a5-48e3-9707-1758b313194b/cabelas_8.7_pro_series_food_slicer_reviews.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_acc8d4feb4bb404d8f7ae81eadd2b43c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f324f85b-7384-4103-9df2-58fca1afea58/state_employees_credit_union_hours_today.pdf
    • https://s3.amazonaws.com/fisulefajow/jquery_ajax_form_data_file.pdf
    • https://uploads.strikinglycdn.com/files/d83ee65e-1ffc-4c0c-a9ed-d105e9d00f70/canon_mp11dx_tape.pdf
    • https://uploads.strikinglycdn.com/files/5bd0315e-f46f-483b-89a1-73582ebd0776/30248588440.pdf
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_4e5e2f15a2494f429de37c1f4a0354e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cfd9fea1-f5c8-441c-af4c-45f95730d4b4/form_of_verbs_list_a_to_z_with_urdu_meaning.pdf
    • https://uploads.strikinglycdn.com/files/82b3cc42-e482-4b9f-b64a-3ab89ed12dbe/my_canon_mx922_is_not_printing_black.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001141e.bin
8bc82a835792dfcf927bb692d123148abf221886b7cf65261a50e78c8b21cdf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 5224 bytes

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