Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ca8f9700b1b4c…

MALICIOUS

PDF

96.5 KB Created: 2021-03-23 18:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 367304beab2ee85cd6f6ab09d5c7595b SHA-1: 5ed0ba05a59eab30b9262b0e9889e8a617396b0b SHA-256: 0c8ca8f9700b1b4c1403394d30b41b76bc9679e709b1973e8b867c225298c53f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent link leading to a page that hosts a large number of other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the heuristic firings point towards a phishing or malicious content delivery attempt.

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 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.
  • 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://druttle.ru/wix?keyword=my+pltw+5.4+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402261/normal_6056711f7fb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5fe709bf5487c.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/convert_webpage_to_on_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_60314f31c6434.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/haryana_govt_gazetted_holidays_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_9e70d34d0eae4a5abc4d296483f714ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6a7fac-1794-4fb1-ad26-cea200656036/jafimusuguzegulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f313bf-4e63-47e7-9fb7-00db8a054561/david_sedaris_collection_that_includes_santaland_diaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70305b57-25f9-42f7-a4fe-dd60d1bc4b9c/1362075240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af79f28c-0d79-44a6-be1c-2e83582ebde9/50311310649.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_86868142704244eb89f0cb30a0f460f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc0a1a8-6e78-4721-9ab2-8781a971432c/dewalt_shop_vac_manual.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_9af7f6364863416f888ee4135354a257.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff603050-f6ae-4eab-becd-29bb2b4e4cf8/welezexot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af47902-924d-4603-8c8d-9b9ef9c5b4e9/35996578387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3260d215-50e3-4d94-a402-a841505ee79b/introducing_second_language_acquisition_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16995f3e-eabe-4db7-b410-8d0465f24ff2/how_often_do_they_update_google_maps_satellite_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31ed546-de1b-4f00-8548-e18509293547/17007129278.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_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 5320 bytes
SHA-256: 5d36b32479920384ea14b76f53808f6e7dc7adc16c802c1ddbed347d4ea01736
font_01_sfnt_off00014c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3D 11968 bytes
SHA-256: e978b4c12cc5f3ead1be52353e606be491bec160323b5adcc523f21a5bbfbb99

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