Malicious PDF — malware analysis report

Static analysis result for SHA-256 f487b198ef0ce46d…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 21:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f81b79da7ed40beacfefdfae34753562 SHA-1: 9f0d76769204496f7326552a26962cb920634494 SHA-256: f487b198ef0ce46d00e715828041aa381133429a0b4680f32c3ca895f055f504
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one identified as a malicious redirector. This suggests a phishing or scam attempt to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=hard+chemistry+questions+and+answers+pdf In PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/pajonoxogigoko-buxaj.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/2217ed.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/6762f7c1660.pdfIn PDF document text
    • https://vapulorefemefiz.weebly.com/uploads/1/3/5/9/135956910/f8a8644b.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/budubusitulavuweb.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/719395.pdfIn PDF document text
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/67097.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/fixelal.pdfIn PDF document text
    • https://jazedase.weebly.com/uploads/1/3/3/9/133997310/gusupilem-gamedujut-vigopesusazivem.pdfIn PDF document text
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/lolidofuxudukez_kerom_lenunomomogu.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/2278765.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/dcde0e1ae4bd30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_5726653ffc0a440399e0ff5a6b39a3ae.pdf?index=trueIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_4d5af63e67494f6a9199c8d529f5aa6f.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_49b6c7eeec204d31a21adc1916bc2de4.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_4f005053f397412dbf284a434367ab3e.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_4e7b0f50dacf4bf58b2f7024a05d2dcf.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_082a233aedf4401baeceee4626067213.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_22393138ed314b1a981e5325a13b8c50.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_e0b23a56c2214c4e8cc0f6e072a8d01d.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_7c5c8f55bccf463db2ec425b29588a7b.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_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 5644 bytes
SHA-256: 3517bc531991cd2e7c9f32f228276be30883eec4357b4aeca71723e6d222d9e1
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 11720 bytes
SHA-256: 2abef2fa3cde97d1a85aebe211ed852c81b75108663a8f07e0365903a97fbe42

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