Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7b03c71f6d9814…

MALICIOUS

PDF

76.0 KB Created: 2021-02-26 02:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7da8bcb590f30af51bc8387669f6e750 SHA-1: a6afd4a4b9826a83ca501a996843459d76e15c2f SHA-256: 8c7b03c71f6d9814ce6cc273a255a67226085672e9a927b173c11d507cf63624
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of obfuscated document body text and numerous links suggests an attempt to disguise the malicious nature and potentially exploit SEO tactics to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=shimano+di2+battery+charger+no+lights In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_6019735c3948f.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/wigomimzlwug.pdfIn PDF document text
    • http://vorecan.fun/narexakexemixxxtij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_601f008b110cb.pdfIn PDF document text
    • http://rezltml.xyz/18648440077p8z4p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_602d3fcdbdfef.pdfIn PDF document text
    • http://stonersfranchise.com/kixasor4k2h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelutusuxipedib.rf.gd/sustainability_merit_badge_workbook_answers.pdfIn PDF document text
    • http://wesaxerofirivo.epizy.com/sozise.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/lifudirazaral.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/arterial_ulcer_treatment_guidelines.pdfIn PDF document text
    • http://godarujugil.rf.gd/wonederopuzozes.pdfIn PDF document text
    • http://sudaluz.rf.gd/ilearning_oracle_answers.pdfIn PDF document text
    • http://tidovaj.epizy.com/kabofarur.pdfIn PDF document text
    • http://xofopok.epizy.com/72496313174.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/99018938199.pdfIn PDF document text
    • http://suvemavukefejig.epizy.com/waste_management_powerpoint_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 5832 bytes
SHA-256: 83fea8ba452cd6da89101d1c2eb9bc3c78ac6de62e18132e785adbfdab865818
font_01_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 10444 bytes
SHA-256: 5b6093ad6364cd5034fd652569b49f7b7d713d65b0f4c0e5ebed881269c028aa

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