Malicious PDF — malware analysis report

Static analysis result for SHA-256 96de1bcccff5e982…

MALICIOUS

PDF

81.4 KB Created: 2021-03-11 01:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8e166589f75352113d1e36b1fb6772ee SHA-1: 546ccc0f8ee7fa49683de895ab5071cfcdf2056c SHA-256: 96de1bcccff5e9829a2309c7f9600eb6fa662d00f8dcab461538d0d579bda4d4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan detection. It functions as a link farm, containing numerous external URLs that redirect to potentially malicious content, disguised under a lure of a manga art guide. The primary attack pattern involves redirecting users through a chain of disposable domains to ultimately deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/wix?keyword=beginner%2527s+guide+to+creating+manga+art+pdf+download PDF link annotation
    • http://apparently-home.com/munazunugorunelejec6lb4.pdfIn PDF document text
    • https://sotumeramevoma.weebly.com/uploads/1/3/0/9/130969712/cb9b945.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/Meu2iez/defender_3_mod_apk_2._5_7.pdfIn PDF document text
    • http://nncucuucuc.space/barco_alchemy_manualrxxjl.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/fqa9qPu/heart_shape_tree_clipart_free.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/devavebodozasogu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/gif60ii/easy_to_use_cnc_router_software.pdfIn PDF document text
    • https://cdn.sqhk.co/sekopanosesu/F0ghghN/shipping_and_receiving_manager_duties.pdfIn PDF document text
    • https://kusovagojevo.weebly.com/uploads/1/3/4/8/134883394/20a99c7abc05.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/durejifuvi.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/retawujigerem.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://uploads.strikinglycdn.com/files/17d12bcf-ba92-43af-a791-57c158f31371/how_to_do_half_life_exponential_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e63a294-4690-4f36-b23d-30627526af7f/gewasawidozazukim.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_4565ebd08cb2462994bca192f92bd58f.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_6d938d7589aa496e926617e0304f4fed.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_823f5570afec41eeb44d869dafe01524.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 5532 bytes
SHA-256: 3bf89e70bbbdfe1f7bdcccea62a5460876899d28b709c4e3c6c2df402b3ef397
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10752 bytes
SHA-256: cd72fb50f1303fbae323d073f648bb5ea1629a06a3e8c526d13281796412c8a8
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f