Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d9991fc84d8b9f…

MALICIOUS

PDF

80.0 KB Created: 2021-05-18 22:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50d943825cc0c1d1c3c8054d8f837d07 SHA-1: 55550daeb7a3898e053a6bb12860d4b4463c6b05 SHA-256: d5d9991fc84d8b9f3f3f6d301e9653c208abe58405deca37f47ffc847004abc8
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to redirector infrastructure and SEO link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/strik?utm_term=exercices+sur+les+pr%25C3%25A9positions+de+lieu+en+fran%25C3%25A7ais+pdf In PDF document text
    • http://penaxuwilamufo.iblogger.org/xovisogasevawuwilasunul.pdfIn PDF document text
    • http://bukejasinopa.22web.org/the_origins_of_totalitarianism_quotes.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/xuxevabuzekef-dorewe-vukig.pdfIn PDF document text
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/8352796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5fd92ab938e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_602f6c1043338.pdfIn PDF document text
    • https://susatabunek.weebly.com/uploads/1/3/2/6/132695662/7491766.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/voforusisodod.pdfIn PDF document text
    • https://xefegirabiveg.weebly.com/uploads/1/3/0/9/130969499/41637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_601ce8edc9055.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/xorukeke.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/dotitusuz-zujesinekebenav.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/d6b773da165a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_604ed3e764e35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5003e374-707b-4299-813c-1afd4efae522/guide_to_black_sabbath.pdfIn PDF document text
    • http://denijutogowe.rf.gd/amazonia_peruana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a22ddb0-4dcc-471e-b888-e22965cd8859/14526005360.pdfIn PDF document text
    • http://kumobeba.epizy.com/97097401718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76057bc-7041-4a53-a899-5b24fa3274d7/dujuripijalatarazaxopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c84da44-2949-4a9f-9091-ec775d88d7bc/ruxawugunar.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_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 5496 bytes
SHA-256: 1fec3072a3b12b91cf3c43afeb6f67a1200bd3b6d25f188291c378460c584226
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 12296 bytes
SHA-256: eed4a45d1348d4d023df7579134de29c308cfb393273dc1a343beaf749f1eb35