Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c20775cee5c45c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 20:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ebdb9a80144f4f7f63fb2d99fc0cabcd SHA-1: 59dc44ab951c08b2f4538e929737bd2154c0a4a0 SHA-256: 18c20775cee5c45c133f74ff5a464dda149e3af00caa7885524772b9afe43c3e
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a link farm designed for SEO spam. It contains a large number of embedded URLs, many pointing to disposable hosting services, with one notable redirector at 'dafemum.ru'. The document's primary function appears to be redirecting users to potentially malicious content or phishing sites through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://dafemum.ru/wix?keyword=digitech+rp355+manual+espa%25C3%25B1ol In PDF document text
    • http://changepass.online/ladizenuwaxexim6ui0e.pdfIn PDF document text
    • https://wuporebepumi.weebly.com/uploads/1/3/5/9/135981990/2368b3.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/2b73886c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_6002e8543a087.pdfIn PDF document text
    • http://soldonlittleton.com/totem_warrior_barbarian_5e_guidew9s6g.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/3000469.pdfIn PDF document text
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/759802.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/gafanaladidila.pdfIn PDF document text
    • http://arnautmebel.ru/253470647492oqmr.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/jomujokidil.pdfIn PDF document text
    • http://igafnd.org/is_fbi_higher_than_swatb5egr.pdfIn PDF document text
    • http://ladyso.ru/rogufunaxegusafemamamupyhjm9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_6050dc9c21ab5.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/1289577c038a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_bb27b89cfc8e4b8c92a08b85271c10f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/vutareka.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_1e2765c56dfd4a56b1005b189b446e11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/zozejiwutikivetevusiril.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_a09cae93601046a2b6171e6e2c52461d.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_2f1ecb06a62f425e87727e5dc393b2b7.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_aba79c13f34f407a87e745b80137fdc6.pdf?index=trueIn 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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5848 bytes
SHA-256: 09d179c524a56a152a5a92dba96351479174dcb138c2d7c7ba0b234eee172d58
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 11672 bytes
SHA-256: a79f652b78d503b7d305aa8fed2a6ff91103ced250b89db7a5a5897be1174f18