Malicious PDF — malware analysis report

Static analysis result for SHA-256 28749bffa31e0f5a…

MALICIOUS

PDF

82.3 KB Created: 2021-04-27 15:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7e9b49e5f9500458beab90b26ccee749 SHA-1: 10128bfdc2aea2b4493f0902d23baf8308d39346 SHA-256: 28749bffa31e0f5af37034167adcb7cd134627a6134edcc8263c37812db8974f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=how+many+calories+in+a+supreme+taco+from+taco+bell PDF link annotation
    • http://pogawubujogeje.mypressonline.com/84798018342.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/nevumekop.pdfIn PDF document text
    • http://gefejisu.22web.org/95418301152.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/convert_file_to_jpg_file_online.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/business_development_strategic_plan.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/59403729493.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/40979379637.pdfIn PDF document text
    • http://baditunabupiru.mywebcommunity.org/22818359972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_36af395898ba4bdfb9b1ce0f838262fd.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_8cb150d904d840daa995a7fb8bbbcedf.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_7142b05b3dd04c8f8e3e6f4cf26c8d1f.pdf?index=trueIn PDF document text
    • http://solezod.myartsonline.com/boostrix_package_insert.pdfIn PDF document text
    • http://jinugiwi.atwebpages.com/51809796012.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/42277797661.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/tire_chain_length_guide.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_236352b4ea2b4b118ec04f14ae028db1.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_ba4cc37fe0674d8abcfc331661e8354d.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_657980e4b7f94f77a9158166cecd80f9.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_883a25bebe4b4a96b068f2197521b4e8.pdf?index=trueIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_41b2684b4e654a278de87fc7f84251bf.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_d3cc154e168644b68583ac6d1ddd136a.pdf?index=trueIn PDF document text
    • http://lifised.epizy.com/wodizirase.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 5340 bytes
SHA-256: 77fc30cb7e4676591505b168bdd6ed3f787de443f01bc322dbb941e2556bb8e5
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10656 bytes
SHA-256: aad167ae513e7f8135cb0b24e374f82ff8d1ac7053f0f855eb71167c5bebd729
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34