Malicious PDF — malware analysis report

Static analysis result for SHA-256 821855772d0f0591…

MALICIOUS

PDF

73.8 KB Created: 2021-02-18 06:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5aef892bbf1603baa2879c5ae5b678a4 SHA-1: e70b7e8dc40cf418783bc646bcbe74585225cff6 SHA-256: 821855772d0f05916dd03eb9fff64914a5030420ae55a5fe67bf6fee22694253
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'cognitive psychology research positions'. The presence of numerous links on disposable hosting further supports a phishing or malicious redirection attempt. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to trick users into visiting harmful sites.

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/123?utm_term=cognitive+psychology+research+positions In PDF document text
    • http://islemleriniz.org/xilosazapoc4spv.pdfIn PDF document text
    • http://topcreditreport.info/37889104101ityyr.pdfIn PDF document text
    • http://the-glow.ru/55226861884oawfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5ff7a18310ab1.pdfIn PDF document text
    • http://svarka-aurora.online/135066881031h7nz.pdfIn PDF document text
    • http://winoorama.space/ejercicios_isometricos_abdomen40j9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5fe28ca2dae42.pdfIn PDF document text
    • http://cybety.xyz/73240463489nlc4n.pdfIn PDF document text
    • http://italiabeach.space/god_simulator_2_script_v3rmillion83377.pdfIn PDF document text
    • http://bupro.asia/65188727874tzbgn.pdfIn PDF document text
    • http://dvestideyli.xyz/ios_13._2_public_beta_27gtey.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
    • http://fomidofuwonuw.rf.gd/devutabelevawubomegovor.pdfIn PDF document text
    • http://mesobuze.epizy.com/vejujomowaker.pdfIn PDF document text
    • http://fotopokidag.epizy.com/bevanesokuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/ramututokesobepatutezu.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 5168 bytes
SHA-256: 0577e12b63f3fc66b6509e64253fa11ce6f4559bd207516f8842d52d9eab05c2
font_01_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 10844 bytes
SHA-256: 1e4790d045dd60cec6d5a83b738b7e83df271f15c3c6a754b63cd646e4919bc8
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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