Malicious PDF — malware analysis report

Static analysis result for SHA-256 7143c4e40f96deae…

MALICIOUS

PDF

104.4 KB Created: 2021-04-01 02:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34fa20d6573a8a3bcbd0025fca4af8e3 SHA-1: 593551fa5526e7457cc0311d6415874c544922eb SHA-256: 7143c4e40f96deae11a13e8f74dd89e686ffd023f96fc3f493f31551b4b7ce53
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 0.9997

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
  • 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/award?keyword=warriors+super+edition+bramblestar+s+storm+pdf In PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/0f3719aaf2598.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/Ijfihji/55751852908.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/kiduge-bewotelasap-zinena.pdfIn PDF document text
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/f653f50c127a09.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/e04c68e.pdfIn PDF document text
    • http://januvasiw.22web.org/appsheet_vs_airtable.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/icRo9jd/53559050647.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jiaJkgd/hobby_lobby_store_locations_in_minnesota.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/kuletilajetexekug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f800c3-2e3a-4476-9ce1-9c05ffbfc99e/brother_printer_mfc_8480dn_manual.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_7e3ea67725df4e198416e79f31989923.pdf?index=trueIn PDF document text
    • http://goniwenu.rf.gd/cardiopatias_congenitas_pediatria_2020.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_6c85772292f749a3a31f63c92e725f22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32cee6c-80d4-4f49-882d-fb6f4698b49b/our_troth_vol_2.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_328b936163da4a6a8ececb524eb27666.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_6ade04cc7b774c8486bb2d228bcb933e.pdf?index=trueIn PDF document text
    • http://dogefifuga.rf.gd/acentuadores_de_sabor.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_84b3386067e846979897c642cd4301b0.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_off00014b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 4444 bytes
SHA-256: 2205974bd600e0dd516b794835dc675a3b6062e485d95e77ee1ae74931f4a9bf
font_01_sfnt_off00015ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE6 5340 bytes
SHA-256: 18b9f0f2e6837813e498ebd6922cd2548e85e71582b3d3d0be46cbd914d91822
font_02_sfnt_off00016d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D02 11884 bytes
SHA-256: 4c0eb049af14d6fb121d7c633d1b9b841a3f3fba5f9e904d5fef3ba0cf458dd7