Malicious PDF — malware analysis report

Static analysis result for SHA-256 8820d55b14890c29…

MALICIOUS

PDF

66.9 KB Created: 2021-02-14 22:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fbcdc2aab48a23a0e7d09d8f2250ea9a SHA-1: e62eca1594814d8e258be4fb78bda7f1d2357278 SHA-256: 8820d55b14890c2924f7daa5ef79f9766b6e1ebefbfbf942a56793554e864d35
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into navigating to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wb?keyword=congruent%20figures%20worksheet%20grade%205 In PDF document text
    • http://theboldpantsproject.com/fuvusisisikjkf8.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/pozikijerimokes.pdfIn PDF document text
    • http://domsale.xyz/98584607488upq49.pdfIn PDF document text
    • http://opssmall.space/pejulapubwnqu.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/6868698.pdfIn PDF document text
    • http://autoport76.online/5372896050bndlv.pdfIn PDF document text
    • http://autoport76.online/66273600529h8gwc.pdfIn PDF document text
    • http://studytogether.fun/68615468039j3miy.pdfIn PDF document text
    • http://reduslimer.website/95362549718ndh15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/amazing_ppt_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/82177855502.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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 5320 bytes
SHA-256: aeada42eaa3b14f0af002f7690f82dfe53a9b8a0ddc83df1f3d1fd19d5b75063
font_01_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 10624 bytes
SHA-256: a9275f05d97911ae0d5093ac8418139756158bfeb79e31e1645db859fce75df9

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