Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1e170b47db137c…

MALICIOUS

PDF

78.8 KB Created: 2021-04-06 23:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a586a2c233e4e6e5112c0002d76e8ee4 SHA-1: 2536f9ecedc5c4dfe2843f178939d5c8159a5e69 SHA-256: 1b1e170b47db137c923c78754c197de611e5e2eafad362597a0139139f58d1c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to distribute SEO-optimized PDFs. It also contains an external URI pointing to 'jumiwimov.ru', which is likely malicious. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body is heavily obfuscated, but the presence of external links and the SEO link farm heuristic suggest an attempt to redirect users to malicious content.

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://jumiwimov.ru/wix?keyword=mike%2527s+one+stop
    • https://cdn-cms.f-static.net/uploads/4379048/normal_6022115ff3b53.pdf
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5fde49480432a.pdf
    • https://cdn-cms.f-static.net/uploads/4469143/normal_6040bd870562e.pdf
    • http://tarenutufitox.66ghz.com/does_costco_have_sodastream_refills.pdf
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5ffa30de86604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vexosafugunu/6940687535.pdf
    • https://uploads.strikinglycdn.com/files/28808d55-2c8f-46e4-b2a4-71cb0bb2c4ed/kjv_bible_concordance.pdf
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_0bf9cc05b48a41fdb8d6d437077fa212.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41bc450b-08e0-4650-a920-d474c99821bc/wagner_procoat_paint_sprayer_for_sale.pdf
    • https://s3.amazonaws.com/lixisariwulo/85223593930.pdf
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_3d4c8c82d5b144f692fd5dac6b2e778b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de0a7b25-ae68-488d-b2a1-d3103a582d87/how_to_define_a_logo.pdf
    • https://uploads.strikinglycdn.com/files/b3da5c29-c739-4bc6-8428-fcb1e210eacd/wekifunesoloso.pdf
    • https://s3.amazonaws.com/welanisowari/inch_thread_size_chart.pdf
    • https://s3.amazonaws.com/sinamozagemoger/gawitoto.pdf
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_67b6b5a99940401280a5c6277a6959c8.pdf?index=true
    • http://vekirosa.epizy.com/mcgraw_hill_grade_11_chemistry_textbook.pdf
    • https://s3.amazonaws.com/kelukakeb/xerox_workcentre_7845_specifications.pdf
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_2ba14fdcd094453a82cd5d27544698ea.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_9a011af45070465eb5fd7955b74663cc.pdf?index=true
    • https://s3.amazonaws.com/zibenoroduzuw/gideriguwi.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_off0000f93d.bin
be996a03b79aaa10cdf51d6cd7fa27a4beb228f69b375f799353196d04646041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 4580 bytes
font_01_sfnt_off000108fe.bin
1eafadfcf75ca8658f730673318cfd6f02cd6c2cc7d6c0e3863131432bbd40cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 10900 bytes

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