Malicious PDF — malware analysis report

Static analysis result for SHA-256 89acc501ea88c0c8…

MALICIOUS

PDF

83.4 KB Created: 2020-11-11 17:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 92f0f9ffe361d4c5654fee2db9759edf SHA-1: 8df91c636fc58107cc08945683a0133021035f73 SHA-256: 89acc501ea88c0c8d41e2bc89f57085a4abe39b986f5a89d2e5af710a33810bb
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF documents hosted on various disposable or low-reputation domains. One critical heuristic firing indicates a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious, reinforcing the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=maulana+tariq+jameel+pdf In PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/1198211.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/7796b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f9f29d48656d.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/b9d11a638d431a6.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/2051470.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/5948696.pdfIn PDF document text
    • https://fogoravirekan.weebly.com/uploads/1/3/4/3/134335139/kototo_newesirifinol.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/lavipubikazox_jofaseso.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/48666f36-0142-4a1e-90c5-0c9a889b3d5e/37364031175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1ccc47-f7cc-47ff-9e2e-acfaf7746662/40592369195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4d71c5-2032-4ba2-aa3a-cab2bde6a3f2/ion_product_expression_for_barium_phosphate.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/80824795030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e9df3a-85fd-4402-b5b5-47aec1d53928/google_phone_book_white_pages.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://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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 4988 bytes
SHA-256: 1611835459e9e5982d7bf1420bea93aed96f5c168f2f7ae4a4433315b9061377
font_01_sfnt_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 14644 bytes
SHA-256: 30841ac3fd459539e72999698406dd60eba720c5c629a71f33d90d9024689afd
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 23040 bytes
SHA-256: aff666e5b4705f6398165919858872a75252603f4d3c96bba0b3a3edf24ad335
font_03_sfnt_off00013202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13202 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3