Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa89ffdfb2b8b96…

MALICIOUS

PDF

74.8 KB Created: 2020-12-06 09:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be72211d11e3bf549aff69893c317c34 SHA-1: 78da45969b4d935dab6840b6599f3a70ac46e044 SHA-256: 7fa89ffdfb2b8b960e37638bc7d7d619abe56695cfd7473794c1db2c5a909bf1
164 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm and containing external URIs. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to 'https://trafftec.ru/aws?utm_term=best+android+emulator+for+mac+mojave'. The presence of a 'download button' lure suggests a phishing or malware distribution attempt, likely leveraging the embedded links to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=best+android+emulator+for+mac+mojave
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/44a42da45d.pdf
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/acdf76d66f1b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed411282-553a-45c3-a817-d53041af4680/21271239915.pdf
    • https://static1.squarespace.com/static/5fc0ecedbf71053ccb1052a5/t/5fc38a3a9ee0f32b87c114e1/1606650427336/cable_cablevision_remote_codes.pdf
    • https://static1.squarespace.com/static/5fc361a140f1034a5cb8c09e/t/5fc74d371d106d256bc0869c/1606896952884/44585810320.pdf
    • https://uploads.strikinglycdn.com/files/5a777f3f-13d2-4920-8007-7f110157c069/lionel_richie_torrent.pdf
    • https://uploads.strikinglycdn.com/files/ec012c00-d348-4b53-974e-0ca6229a1dc5/lalere.pdf
    • https://s3.amazonaws.com/zaxawetawupo/wivadujinukexamet.pdf
    • https://static1.squarespace.com/static/5fc0e92a0a2757459be2ed0b/t/5fc15ccce6d49a06bbc539bb/1606507726083/baseball_games_unblocked_espn.pdf
    • https://s3.amazonaws.com/tumasun/chapter_25_to_kill_a_mockingbird_scout_quotes.pdf
    • https://uploads.strikinglycdn.com/files/e7998168-3866-4f2e-85df-f036153e6ae4/40302762242.pdf
    • https://uploads.strikinglycdn.com/files/84b888ca-9621-43c6-bbef-c55a554aecac/kipupasak.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_off0000e6d0.bin
409cb9138f9b022ab84cc2fb897d6e78d840798e05ee3db0e8fbfb0b84a1bda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 5352 bytes
font_01_sfnt_off0000f900.bin
707bd7d7b8eb17e70bfd1c50ebbccffbf74ca1990b21d9bc4e25c69a939ee026		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 10932 bytes

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