Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed4d5fb738d4788…

MALICIOUS

PDF

98.7 KB Created: 2021-03-25 05:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7285a9abb38d0753e2c108fd9cfdf31c SHA-1: 7d2dce6c11c8b4864c52cc8cf0aa0ac8cab44f22 SHA-256: 5ed4d5fb738d4788d6b8accef145bd8d2d8e5dc87e7dd316f98bfde3d3f87459
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'botokaw.ru', suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/aws?utm_term=romance+of+the+three+kingdoms+book+amazon
    • http://creamwalls.space/first_strike_advantageyvzdq.pdf
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fcdfdb9807d9.pdf
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/9d2e93a033761f8.pdf
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/4c339faf484948.pdf
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/3864e8.pdf
    • https://cdn-cms.f-static.net/uploads/4446036/normal_5fdc1faec94cd.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/global_smartphone_vendor_market_share_2019ecdh3.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ffe065aab386.pdf
    • http://chambreapp.xyz/2250043962pr53b.pdf
    • http://raisinshub.club/elbow_bursitis_exercises3rtvb.pdf
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/kaxomesefate_julijojomopal_bokatesawi_lanodut.pdf
    • https://cdn-cms.f-static.net/uploads/4378846/normal_604a68672c782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_a3b72c6df80f438a8af7d3659d3a952e.pdf?index=true
    • https://s3.amazonaws.com/wazotojemov/30237251952.pdf
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_b5f79156efab41e59ee7282cba3c7b7e.pdf?index=true
    • https://s3.amazonaws.com/dinisemowoge/cloudformation_iam_role_managed_policy.pdf
    • https://s3.amazonaws.com/gotenukevepunin/gifted_hands_movie_questions_and_answers.pdf
    • https://s3.amazonaws.com/gafedupeba/jazokani.pdf
    • https://s3.amazonaws.com/nuxulikiwab/general_pathology_questions_and_answers.pdf
    • https://s3.amazonaws.com/pusixa/fundamentals_of_heat_and_mass_transfer_6th_edition_solutions.pdf
    • https://s3.amazonaws.com/tesodagiwor/24377265685.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_off00013281.bin
3acb74eaa6a8c06bc37d2719c9fe1812643676ae1396b2c1a54e486b5b21a83d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 5452 bytes
font_01_sfnt_off000144da.bin
310c23ac59fceb1945ae5978c76d13fe95fdb94d236593cf12a78c8ac407c9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 12624 bytes
font_02_sfnt_off00016f41.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F41 4324 bytes