Malicious PDF — malware analysis report

Static analysis result for SHA-256 87079c4bf025bc1c…

MALICIOUS

PDF

74.0 KB Created: 2021-03-16 12:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34214bab61220b3e962c3c55433871dd SHA-1: 2850f4687ed2b99e13dc96a7aab1701bf8f2dfdf SHA-256: 87079c4bf025bc1cc3a5bc83c4c7fc3b93b4ce8e1d8c44bed2e1ad423277ccd0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a significant number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users or manipulate search engine results. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://ponafet.ru/123?utm_term=ashoka+tree+all+information
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/titojisukogizepiriva.pdf
    • http://pagavopalubutu.scienceontheweb.net/gakisilesazofeguwanovav.pdf
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/bexewexaxaseku.pdf
    • http://tupaxeguna.scienceontheweb.net/65523395090.pdf
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/wafapusejesanar_dibamomew_vetevelivodofu_milabo.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/8620614.pdf
    • http://lodomujimujug.mywebcommunity.org/honda_gc190_pressure_washer_price.pdf
    • http://zoguponuwuxoli.medianewsonline.com/59714932843.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/489ee4d4-c576-4b9d-b408-aba2da025113/xefemelokokebifotoxo.pdf
    • http://zonafikepejese.onlinewebshop.net/bosch_800_washer_dryer_combo.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_93903a8c025144b9be046e70bd67817e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01628e23-68e5-4d29-bed5-63821bc33f42/star_trek_movies_new_cast.pdf
    • https://uploads.strikinglycdn.com/files/45aaadbd-2665-45b0-b5bc-9fac48d1a03d/download_divergent_full_movie_online_free.pdf
    • https://uploads.strikinglycdn.com/files/c427f36e-e2b1-4d5e-bab8-fed4daf8bab9/naxizekolebafu.pdf
    • https://uploads.strikinglycdn.com/files/6a8c9e1b-ca7e-4f30-aed8-9bf44be5a548/52762076064.pdf
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_12925af5794841308f0e034dc1bedd52.pdf?index=true
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_68dbfbf7eed048e38933471b7b93d664.pdf?index=true
    • http://mixezized.myartsonline.com/anthropometric_data_sheet.pdf
    • https://uploads.strikinglycdn.com/files/06153843-b2ec-45bf-ac74-a59d45b27c07/zikokug.pdf
    • https://uploads.strikinglycdn.com/files/ffdf2529-dcc5-426e-aaef-5dcd150553db/what_does_burger_king_have_for_breakfast_menu.pdf
    • https://9607194d-0e7e-4366-bfe9-208bb3d0b89d.filesusr.com/ugd/c068f8_ed1dc3b494b34a4fa0b0f4b72e7568eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9ecbfdd-3362-4ecb-9ae4-dee8ded4ffca/91512404896.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e7.bin
6877b5f204b032b0614df38a11ce45a458c9e881e10889ff06296788ce7962ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5060 bytes
font_01_sfnt_off0000f6ef.bin
b6163cc03c699e56bf93d55de6edee5ad7d35e3589bee5d1f3bb0f355269ac52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 10568 bytes

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