Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a6a26afc6f585d…

MALICIOUS

PDF

34.1 KB Created: 2020-10-29 11:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d815d886e08030f36274673a7737865e SHA-1: 543eaa4b1a886b6a7d93a9c99f95d592abebf619 SHA-256: 47a6a26afc6f585d8be320aa255f4be167b827280727371b3e77c6f0b0f15e89
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a single image lure and a clickable link disguised as document content, which redirects to a malicious URL. It also functions as a link farm, hosting numerous external PDF files on disposable domains, indicating a campaign to distribute or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 34 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://cctraff.ru/strik?keyword=brother+ls+1217+manual In PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/eb251.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/9928676.pdfIn PDF document text
    • https://pozosukezogi.weebly.com/uploads/1/3/4/3/134386022/lepetotozi-samunozakexip-lolano-likovikibuputog.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/noxokizug_vonadamobal_xarurululilen.pdfIn PDF document text
    • https://jirixakevafu.weebly.com/uploads/1/3/4/4/134404576/e6a0b787761bb8a.pdfIn PDF document text
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/2396455.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/2484142.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/5171287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f97a8a394260.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/vesupa.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/4d784fb31cc88.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/4830881.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/webuligavedike.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/1135453.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/7b0bb45c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f891eb8c22a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b003491-2fa6-4fda-8b6f-b95ec464ed75/7451214848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b5db10-51e7-43dd-bb90-1434a71ef647/judezaxuruxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa82510-281f-46ad-b557-9edf96118cee/82486665758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61acb1ff-8ef3-4782-a031-187aaf41d422/fundamentals_of_computer_graphics_3r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c136f1-15bc-4baf-9104-8e19080fa7c6/tapanugobawadumitugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04888721-9bbb-43f1-9284-d122fa905a09/35287074215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb0adfd-7700-4640-ba46-b072b1e4edfa/gateways_to_art_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cf1c82-f931-40d1-a807-f592963387f8/57352852098.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD6 5236 bytes
SHA-256: a7cbf3caa3cde2af5feb75ad1909a77643ede8938699c0708e63483b79261cec
font_01_sfnt_off00005f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7E 8164 bytes
SHA-256: d5ebd1c8c8b573baf119bfc80c8da730d25b88e03b687cdcb90cce95ff43f7f5

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