Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9a4e535a2a5f4f…

MALICIOUS

PDF

56.0 KB Created: 2020-12-15 21:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 814ec84e111884b673b0077db8a014c8 SHA-1: 1ca9b5466f975e3ed15be7ab817fe1574d9e658d SHA-256: 1f9a4e535a2a5f4f4f797c5fb6b22ce74fde3eb3060c4f86825214b92ce497d8
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot used to hide clickable elements. It contains numerous external links, including a link farm, suggesting an attempt to redirect users to malicious sites or download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 56 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://trafffi.ru/123?utm_term=icls+2020+twitter
    • https://fejopipuzag.weebly.com/uploads/1/3/4/3/134308805/vuwutas-xotowofemo.pdf
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/4b1ec0cdad637b.pdf
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/3925195.pdf
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/kerafemedexixoj.pdf
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/witojusogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/443723e0-7e19-4818-b8cc-b1e821e48f5d/50120579488.pdf
    • https://uploads.strikinglycdn.com/files/ebe65876-1bb6-4eae-8555-1016a6576499/lake_wilderness_park_boat_rental.pdf
    • https://uploads.strikinglycdn.com/files/48fa57d3-0ddd-473f-ae68-ceb37b1a09dc/guwapezewo.pdf
    • https://uploads.strikinglycdn.com/files/986b128d-636c-4891-8a37-1501745bfeda/american_polity_5th_edition_xaam.in.pdf
    • https://uploads.strikinglycdn.com/files/50998a16-c93e-490f-a431-3eb4f9bdbffd/athenaze_book_2_download.pdf
    • https://uploads.strikinglycdn.com/files/92cf2320-8b2d-4bc5-871a-c9afe883da2d/amazon_basics_gaming_mouse_review_9_button.pdf
    • https://uploads.strikinglycdn.com/files/ea4032bb-b74d-4996-b4c0-a157b3bab56f/biological_science_freeman_5th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/6ca8f66b-2bda-4763-82e4-8a9fd8f9afad/bamolawinole.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_off0000a848.bin
0ae98cb3f4bd2d6a7b53fd53792661811c5ec3f0943d144d0ca2957d05a08be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA848 4884 bytes
font_01_sfnt_off0000b910.bin
e6bd21589668d9e421df4ca5cece5d65c7e15da53bf977b439a0efa1b85209f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB910 7888 bytes

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