Malicious PDF — malware analysis report

Static analysis result for SHA-256 7118e92b2311fd74…

MALICIOUS

PDF

65.9 KB Created: 2021-02-23 17:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 730d6e36b2bf53ca18dd1f288b7ffcba SHA-1: 3758d92e5104472734fe40722dcb289d0e2c1f78 SHA-256: 7118e92b2311fd7481c2fa13f610d8c775369229c0d72af0fa9d5b28de41de25
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to search queries. The presence of numerous links hosted on disposable domains suggests a phishing or spam campaign aimed at driving traffic to malicious infrastructure.

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://crophysi.ru/123?utm_term=calories+in+chicken+taco+salad+with+shell In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fecf29048ed6.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/gdNshfc/99332903030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_600feffeb5336.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/iiojgBI/kageriwage.pdfIn PDF document text
    • https://cdn.sqhk.co/xituvusaw/hoFJ5Bo/tigekitatiteporuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/Ygehiie/safavofibibobaxutepeso.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/dfUKBOW/on_rail_shooter_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_60139a2c41e57.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/ielhcbt/nexavexeboma.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/ij2tVer/spirit_ride_free_movie.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/kuseba.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/jebokizez/nalavutolufuxus.pdfIn PDF document text
    • http://rifesos.epizy.com/87605209289.pdfIn PDF document text
    • http://seguwogira.rf.gd/95324232039.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/canon_5d_mark_iii_specifications.pdfIn PDF document text
    • http://wozawexopad.epizy.com/mufopulinek.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_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 5088 bytes
SHA-256: ff31aa9f45a32b47c99266def34beb83c106c6dd3098ab107003a75827bf3769
font_01_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 10272 bytes
SHA-256: 7deec4906506c9d430f92671109bc2658de43b6f8a0306e575f0dd61b98db577

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