Malicious PDF — malware analysis report

Static analysis result for SHA-256 645de9eaae381c6d…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 01:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258228016a56fb327507c5f8f6054789 SHA-1: 2f1c0609aacb74119aaa2370245d106e8575d1b9 SHA-256: 645de9eaae381c6de890d8fcd4a17636c5ccffefb1e7bed9aa00d7bd85ff6224
164 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which are to other PDFs, indicating a link farm. The presence of a 'download button' heuristic and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged the PDF with a high probability of being malicious. While no scripts were explicitly extracted, the PDF structure and link farm are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=world+of+warcraft+cataclysm+leveling+guide
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdf
    • http://nakotigolajeg.scienceontheweb.net/32117400882.pdf
    • http://xitabijasava.getenjoyment.net/interstitial_lung_disease_treatment_guidelines.pdf
    • https://static.s123-cdn-static.com/uploads/4460694/normal_6003b4af404e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosalizuzu/android_developer_mode_mock_location.pdf
    • http://xomapagovujux.atwebpages.com/babok_version_3_free_download.pdf
    • https://uploads.strikinglycdn.com/files/ebe89359-c69d-4bce-8bae-33b4c9881680/bidofixinovaxemutadewit.pdf
    • http://wudafozejuniv.rf.gd/53979511981.pdf
    • https://s3.amazonaws.com/vuterijoze/best_mysql_books_for_beginners.pdf
    • https://s3.amazonaws.com/poguvelefa/45191814171.pdf
    • http://vebusatoro.atwebpages.com/calendar_method_of_family_planning.pdf
    • http://vuzudaru.epizy.com/toruwewitapodorixutovajoz.pdf
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_2579d429b02e46c4ac8a1b058f7c64a1.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/kadinaratezodemuraviz.pdf
    • http://gefetela.epizy.com/gaxerelogipibewuzix.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_497f77d53bb34653a610c44bc8ddb034.pdf?index=true
    • https://s3.amazonaws.com/jeponowon/nacte_guide_book_2017_18.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_3135bf6fba8e42bd9c479020389090a5.pdf?index=true
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_564e9e713b1a41d7b590a20bcf97222f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9966520e-7961-467f-ac0b-dd85d9266372/nalavefiwarezabesi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66d.bin
9cec70413dc575192a660c71241bdf31f401767e86041a0d5c17444808738cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5608 bytes
font_01_sfnt_off00010987.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 1800 bytes
font_02_sfnt_off00011215.bin
b4c04fd2a640c5bf63636d04a9a823dbc2b4a22ea09992c3671146db79706a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 10724 bytes

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