Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49ee95089013a12…

MALICIOUS

PDF

93.4 KB Created: 2020-12-27 22:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd8b7ee184b1b4d1e1ccb651bf72be13 SHA-1: c07b65b403ba38729b3b646027fd783141401856 SHA-256: a49ee95089013a12195c7f0f4ad67612a8e5a73bd3260214d42f36eabc7d6f63
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. One of the primary links points to a URL that includes a 'utm_term' parameter, often used in phishing or malicious redirection campaigns.

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
  • 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://traffnew.ru/123?utm_term=minecraft+story+mode+fanfiction+male+jesse+x+lukas PDF link annotation
    • https://fudafovagovareg.weebly.com/uploads/1/3/4/8/134868702/vojonuzosenewowo.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/hfhgkqT/30149545059.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Pjcjgij/bedar.pdfIn PDF document text
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/midopub.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/hCgcLwO/rotator_cuff_injury_exercises_for_elderly.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/terivuvedovu.pdfIn PDF document text
    • https://nepagezefo.weebly.com/uploads/1/3/4/4/134472827/noliwefupibaxu.pdfIn PDF document text
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/jofedod.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/ihfgeFB/mexican_football_player_carlos_crossword_clue.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/menixuk-vuzumiv-xofezuro.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/tinezedu/catanzaro_informa_allerta_meteo_scuole_chiuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ae3fed-318e-4167-8651-5b255f31056d/custom_ruger_10_22_wood_stock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3549582-0832-461c-b4e2-05762c8e7771/rikabesugezakaku.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/vascular_malformations_in_the_brain.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/bhajan_ringtone_mr_jatt.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_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 5484 bytes
SHA-256: 65a8a2b193fe5adcb2c19f5951b8292adc31b12dd5999c29c1691467e51d79f4
font_01_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 10492 bytes
SHA-256: cacaa51616c5e1d7f84227952ae8509a55852bb3ec81349cc8ff01cceb9a54d8

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