Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3568475f81b7ed1…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 04:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8db2dce7f17b8fe051b8c178dec049d4 SHA-1: d4a381eb89cb0f4982625a413415169a3883d0f4 SHA-256: d3568475f81b7ed18db34e38193e414e823baf3a58fadd8d90f2e36f35113a32
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to a book title and authoring application, suggesting a lure. The presence of multiple disposable domains and UTM parameters further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=the+hiding+place+cj+tudor+epub In PDF document text
    • http://latencfsrt.space/vebisanbbwbq.pdfIn PDF document text
    • http://obmenkalnr.online/355498208505rwp5.pdfIn PDF document text
    • http://tb-films.ru/podenm8ult.pdfIn PDF document text
    • http://zumedemuruva.22web.org/toxawoselijakogusagig.pdfIn PDF document text
    • http://kismykeitio.best/83059522880k2i20.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/Y7GhbfA/48059123924.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/giczKji/skins_de_crafting_and_building.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ja56jcy/space_hunter_alien_shooter_warhammer.pdfIn PDF document text
    • http://nafugelinev.iblogger.org/what_is_social_science_methodology.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/DBuje1S/75475649338.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/cihiLhh/fatojogupi.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/egdAibz/t-_mobile_digits_review_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/Ugciajx/wekakanosudevapis.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/60hhwjd/82892656579.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/rekawexuretowo/webixozubukaviwi.pdfIn PDF document text
    • http://pejigevug.rf.gd/vapor_barrier_installation_guide.pdfIn PDF document text
    • http://tikobonojaxax.epizy.com/sibabagokozesuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/25749683570.pdfIn PDF document text
    • http://xedovafimolodem.epizy.com/83825145909.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_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 5324 bytes
SHA-256: 03391243e3fcdf955e8306c20c7c1c053eee27edf64037979c54725886133fc1
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10328 bytes
SHA-256: 2b12fcb2d64a60715e083be4ce14c899c330e85fba3f6c4a7fe2dab64618d3b7

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