Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad9f8b2d40fcafc…

MALICIOUS

PDF

75.0 KB Created: 2020-12-21 18:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 79ca8b5bffb1b4e1713f0514e4a93d0f SHA-1: 9549fc448c3de8a4fc32275500826b841352acf0 SHA-256: 7ad9f8b2d40fcafc9c697f1077ced4c13109f819e454815217fcf8769a7c8ffc
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to a URL that appears to be part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to downloading software, reinforcing the phishing lure. The presence of numerous embedded links, many pointing to external PDFs, suggests a link farm designed to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=download+simply+piano+by+joytunes+mod+apk In PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_5fc189b99b4cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_5fba9086ac783.pdfIn PDF document text
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/1823466.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/54870b8411.pdfIn PDF document text
    • https://jutixabit.weebly.com/uploads/1/3/4/0/134017524/395883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86fb122ded8.pdfIn PDF document text
    • https://sizuzoxoxef.weebly.com/uploads/1/3/4/8/134846633/novijo.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/zirojopemup/3m_duct_tape.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/iowa_dot_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc826ac3cfda2dcf0aa550/t/5fdd197cca73133e5812c35e/1608325500577/71106264891.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe895e5c7695ca99606f9/t/5fc0edad18e72e5fdbf90bf5/1606479278266/3734822774.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12254405d5340f32af944/t/5fcec3aa64290b1c3dc2e2ab/1607386037506/lojokapose.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/labexaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 5364 bytes
SHA-256: a517ff8314075ed98069010301654ccb22ac8a2e65013d95d837c437b8981d09
font_01_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 11600 bytes
SHA-256: 1567a9b6e91bc8e72c6d4c6363c5b79508de70d92c8a13d9e137a224e2a3031b
font_02_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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