Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fafbad2c71dbbf2…

MALICIOUS

PDF

96.3 KB Created: 2021-03-28 09:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1cdd40e92fea00e9af19e630aeeb0996 SHA-1: 18230132e291f8db6ac913dc1289cb83db1122f9 SHA-256: 1fafbad2c71dbbf222cd3ee80c84e6291eb605bfdd59b822cba368628aaed467
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yafferge.ru/123?utm_term=bikram+singha+full+movie+hd In PDF document text
    • http://maxoranano.sportsontheweb.net/sibajezalatev.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/1368799.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/9e875b713050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fc5841ec85c5.pdfIn PDF document text
    • http://lemufarora.22web.org/gegizidujuzesowev.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/5198adceda5f876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_6036034ba408e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_60067f7f6950c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulenanevatetid.epizy.com/80012736749.pdfIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_521704e8658f4c3abf0a82f66238a51a.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_33397b9a29e344d680536d9f06069207.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_44b73672eb4d4b9e8a265bcfba557eff.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_2f9429e0ae1743869c758e49dac017b2.pdf?index=trueIn PDF document text
    • http://nigagemi.rf.gd/astrologer_s_day_story.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_9704700a8b224c63974185bd283ff1fc.pdf?index=trueIn PDF document text
    • http://vidugozu.atwebpages.com/60196263930.pdfIn PDF document text
    • http://xalogazu.epizy.com/english_literary_devices.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_e6f9f88639e54ca49e80d044c0c70ead.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_16778c0e98d5413885f3f7c919e92463.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_5a46d031d11c4e9d96f46499e1755da5.pdf?index=trueIn PDF document text
    • http://zapizuw.rf.gd/zimemesedoputesixu.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5492 bytes
SHA-256: 8e3c6776825a7d71f3cbd4b89354eea69881525e3a5e49d5e5b924a922baefc5
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 14708 bytes
SHA-256: 4888a2ac56a37beb9b159a78c18b16ee4aa458118a8565c61db117fbea2b425a
font_02_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 11312 bytes
SHA-256: 2b6f0612366aeeeac2aea160364966c9ed425aa6aed7428876ce0a10f2113214
font_03_sfnt_off00015b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15