Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1cfc2ab3d5799a…

MALICIOUS

PDF

136.6 KB Created: 2021-05-25 03:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 597105d1199bcd853d8a455f24ff6257 SHA-1: 68afa84d76987a03f611669cf1310c6eac906d92 SHA-256: ad1cfc2ab3d5799a2932cdad045181ae60ab433cbf6e531355dcc2dbab9d4aa4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various external PDFs, many hosted on disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/strik?utm_term=karcher+k4+pressure+washer+parts+diagram In PDF document text
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/wubogijox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_603575180a933.pdfIn PDF document text
    • https://zujizivuzilinum.weebly.com/uploads/1/3/5/3/135344014/wenemepava_movesije_xenato.pdfIn PDF document text
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/2dcf555.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/wenad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6017a6ae661e7.pdfIn PDF document text
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/tagazexewane.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/14c7302d232df92.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/db298305.pdfIn PDF document text
    • https://zumaninerotuz.weebly.com/uploads/1/3/1/6/131637595/6562d1.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/boxenodigus_mufugabetap_zikakipuzikoj.pdfIn PDF document text
    • https://mugunujepigujov.weebly.com/uploads/1/3/5/9/135992134/nefun-zixuzalovejoru.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/zasuguwafof.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/2770805.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/purixifusipelid/9911136622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8227e5-4d26-4368-a5af-73654b55dc7b/what_do_shipment_exception_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/microsoft_excel_2007_tutorial_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/fukusewusifonulojawus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00e6e62-e73e-4032-8858-2516e1404f29/what_is_a_goblin_in_the_hobbit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4972dea1-c096-471e-a4c4-c282b1b0e413/wuxirele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e726bee-829c-4993-a94e-0820a3cd2b76/players_handbook_dungeons__dragons.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 84116 bytes
SHA-256: fe4219dbfc4046b753576fab2ca26667c5d563f49570a3e2586c2047afdfbbed
font_01_sfnt_off0001ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE42 5332 bytes
SHA-256: c48b3367d1765fd7d2b6eef0c1164fa61ece6a0caaf8e0d35ce795a7404d5f93
font_02_sfnt_off0001e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E080 10328 bytes
SHA-256: 45f9de687ad498650fe73efba0f76c60197d5fa5033971f666e536a5f3e78ff7
font_03_sfnt_off000203cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203CC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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