Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa0a77b60e96d56…

MALICIOUS

PDF

87.0 KB Created: 2021-03-28 23:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99fea85967cee6b4f401d4bde2b1feb1 SHA-1: 383e0653e1e6ec25d5d75e339fc26b63687e454a SHA-256: efa0a77b60e96d564658eb21ada3ecae1b0a8d684628834aacea57fa57ca8712
164 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 are likely part of a link farm designed to improve search engine rankings for the term 'heavy duty truck systems pdf free download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jumiwimov.ru/wix?keyword=heavy+duty+truck+systems+pdf+free+download
    • https://cdn.sqhk.co/lipetebo/VK5kfig/71403423114.pdf
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/d4a55cb30e96083.pdf
    • https://cdn.sqhk.co/zoxinugokas/jbif2n4/zorirowurobefezed.pdf
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/ad84f624cb9b.pdf
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/jusaveledifesigov.pdf
    • https://cdn.sqhk.co/lilomovetum/NohhFji/dungeon_defenders_2_crossplay.pdf
    • https://cdn.sqhk.co/tororukiwuri/bcYAggf/72224818638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuwabobujasivor/86215823700.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_6e1b93b56b66495484aab77f1ddecc40.pdf?index=true
    • http://kedefusa.rf.gd/23504584229.pdf
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_2c7b8a9153af4a2ba285e747f3a50e30.pdf?index=true
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_2b5d7cffa4a741fcba244c1f8ff4c677.pdf?index=true
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_142c3d3d992f4be2844d25ac4ba9c0e5.pdf?index=true
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_c599b5aff74d4d9fa02d627ea6d6b987.pdf?index=true
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_3b353295fe374b93975204df388046c0.pdf?index=true
    • http://lidiwerefibe.rf.gd/mansfield_ohio_police_department_accident_reports.pdf
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_c3b758e4dde04a71a6c84eb50b4a7ecc.pdf?index=true
    • https://s3.amazonaws.com/kovozenamofox/bpe_ups_3kva_manual.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_0f2485cbb1dc45e8a2983306569da33b.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_6f0a59ed099d4507aa60f41bf8feff7d.pdf?index=true
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e2eded917d6f46d8989f3e851d5a343f.pdf?index=true
    • https://s3.amazonaws.com/fidobakipivogit/vonopaniwepururixujigil.pdf
    • https://s3.amazonaws.com/miledu/ielts_essay_topics_with_answers_band_9.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_off000108a2.bin
27b748ee931503da7bbd748c21e6b962001e2b36dc9ea055ea975387d771fc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 3212 bytes
font_01_sfnt_off00011421.bin
2d64f4502d3ff99e25fc1395ee14410b84cb51731c8ec70ceca3ace938656de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 5580 bytes
font_02_sfnt_off00012727.bin
6aa21aa7de53a852e02281efc3edec502bcd6f1dddeab8d4b13784dd538d404c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 11360 bytes

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