Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df20dca41a3cb02…

MALICIOUS

PDF

75.1 KB Created: 2021-01-11 12:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c61ed968cd101acc38051756c49f6af SHA-1: 0ff93834a31e3e613696542e2dcfa9b88ef980a1 SHA-256: 5df20dca41a3cb02b230d405452ab20eed061e000137284e99ab019812c9a841
244 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract traffic. One critical heuristic indicates a direct link to known malicious redirector infrastructure, suggesting the primary purpose is to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/wb?keyword=hustle%20castle%20rune%20event In PDF document text
    • https://pisefipekopaz.weebly.com/uploads/1/3/4/4/134461515/jijetu-kumozavibig-fizilifu-zilodibajedafuz.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/6132667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fab37e77affc.pdfIn PDF document text
    • https://renalulawe.weebly.com/uploads/1/3/4/7/134735886/3402418.pdfIn PDF document text
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/vurutupe-xanazalofofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5f942e7d01ebf.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/wuzokeziv.pdfIn PDF document text
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/d3ff02b85bc42b.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/ggusjjH/92542530966.pdfIn PDF document text
    • https://cdn.sqhk.co/vozupowo/jcheidl/1819866904.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://s3.amazonaws.com/jifedefujodu/takeuchi_tb135_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/25389804181.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0F 4536 bytes
SHA-256: cc42da77eac7fd32806eceaa4fc34fa9d0c7403453dd2f7c4b481e5a107c5b8a
font_01_sfnt_off0000cb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB79 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10220 bytes
SHA-256: c815fffa13d31bfd0134c14f9cc9a7a63f30b790faa198f0e5d99fc21e3c02d9
font_03_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16764 bytes
SHA-256: 96dbea7eeb2ff03ad84474872a37f14a9de29ecd83853ef5aad7abb0563eb65c
font_04_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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