Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10f096467bf69bd…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 10:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5629375fd201135a4db9c69838cd61fc SHA-1: 9814e41f7f3c7a6593afc5dd143a5340cd5d0d09 SHA-256: f10f096467bf69bd72cd2374b9dcbb6d22ecce7ebff64332731bec3c17f85691
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links pointing to other PDFs hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The presence of multiple external URIs and the ML detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/wix?keyword=coconut+cures+bruce+fife+pdf PDF link annotation
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/lovigijepota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5fcac9b7dbecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_5fe2facfee026.pdfIn PDF document text
    • http://ferejupaxebul.iblogger.org/fuzajafavukaxujizetiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_6012654140a11.pdfIn PDF document text
    • http://poradoit1.site/79180456905pp6g6.pdfIn PDF document text
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/1834407.pdfIn PDF document text
    • http://repair-planshetov.ru/scott_pilgrim_vs_the_world_game_nintendo_switch_pre_ordergxe7d.pdfIn PDF document text
    • https://serijarivak.weebly.com/uploads/1/3/0/7/130776739/b5f6f6856d2.pdfIn PDF document text
    • https://genexopeg.weebly.com/uploads/1/3/4/6/134661587/7301730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6010750b2ddd3.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/divopasub.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/1356101.pdfIn PDF document text
    • http://molotkov.site/boxoton86ea3.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/6585281.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/filujonujegoxodov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipimusamed.epizy.com/61925966176.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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 4952 bytes
SHA-256: 2b99d1b6a8eb644e0be7ccc0e0c4694b98fa23308729ec6b09de05b2c7eaa355
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 10516 bytes
SHA-256: 2546c1cbd0b2e71e6ed7223e64803d5eb314ca892438e5a7bebc5b00dbb260c5

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