Malicious PDF — malware analysis report

Static analysis result for SHA-256 389314906c0590a9…

MALICIOUS

PDF

75.7 KB Created: 2020-12-18 13:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74a9626adf2eb12221076f49924b603e SHA-1: 5ce13b248d30854bb50bbb030948bf934c38109c SHA-256: 389314906c0590a9956c2c8bb0d16dd3c7fdc09e0fdd640dfc13cbccd10c09f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, https://trafficel.ru/123?utm_term=stanislaus+county+office+of+education+trainings, is likely a phishing lure or a gateway to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=stanislaus+county+office+of+education+trainings
    • https://tupekado.weebly.com/uploads/1/3/4/5/134514551/fulafi-witod-defaxajuseta.pdf
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/latujikej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4880150e-402f-4c98-aa10-3c39ca73f608/37510807598.pdf
    • https://static1.squarespace.com/static/5fc0efc3b8467722f1d478d1/t/5fc1400208845d0924b84591/1606500354342/50862830008.pdf
    • https://static1.squarespace.com/static/5fc10a34403f5353fd968438/t/5fc7791409f4d56e8f86d0be/1606908181689/apple_tv_adblock.pdf
    • https://uploads.strikinglycdn.com/files/ea95602e-b3ab-487f-accc-8a230420a74f/zibafidakolezik.pdf
    • https://uploads.strikinglycdn.com/files/26e00f4e-40ab-4801-a598-603cc59c34ce/gorillaz_album_zip.pdf
    • https://uploads.strikinglycdn.com/files/39ccee72-f446-4eed-825c-cf9d97520079/elementary_statistics_bluman_free_download.pdf
    • https://static1.squarespace.com/static/5fc0d785085bf90c0efcc6ad/t/5fc26819f81c9a2a0cefcb35/1606576155474/logab.pdf
    • https://static1.squarespace.com/static/5fc64e6c2e34347c70694bb4/t/5fcd0560eb18547f4b88354b/1607271778691/the_pirate_caribbean_hunt_trade_guide.pdf
    • https://uploads.strikinglycdn.com/files/738cdcf9-86fa-48b0-ab4f-f73a04aa5148/savumo.pdf
    • https://static1.squarespace.com/static/5fc7b50cd743eb43444af1c9/t/5fcbc00d7ab0f364abb42307/1607188494137/chess_online_application.pdf
    • https://uploads.strikinglycdn.com/files/a6bc1652-f771-408e-8205-4975ababf636/ihome_clock_radio_manual_ipl8.pdf
    • https://uploads.strikinglycdn.com/files/f8e2e33e-41f1-4399-b03d-ffcf58c52782/boston_market_nutritional_facts.pdf
    • https://uploads.strikinglycdn.com/files/e9e0bda2-bea9-4566-a52e-4f07b42c946e/mp4mania_movies_hollywood.pdf
    • https://uploads.strikinglycdn.com/files/dc04e52f-cc36-4fc1-baa4-248e02cd53f2/2484959762.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_off0000e78f.bin
4f268921b47f08b20537396a19d53e7dc1ce6903083405995aa0e164804a2343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 5392 bytes
font_01_sfnt_off0000f9f8.bin
aa973f380cf166d2a6f98b1c076d45b4e45d9c6520b105b2be8c91501f302a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 11648 bytes

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