Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1af280218744524…

MALICIOUS

PDF

70.3 KB Created: 2021-05-11 03:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43b83e30cacf533ebc0916e39129533c SHA-1: 21131d1969ae2cbc989f393ae1b4fe79a4359981 SHA-256: f1af280218744524f9ec91bbba1cf43437af096f80b32b983d66329d198899cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and utilize UTM parameters, characteristic of link farms used for phishing or malware delivery. The PDF structure and the presence of multiple external links suggest an attempt to lure users to malicious content.

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
  • 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://zajinet.ru/strik?utm_term=badger+garbage+disposal+model+5-81+manual PDF link annotation
    • https://cdn.sqhk.co/wepigosogo/chjLhJP/18820119961.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/jaiijaN/samsung_galaxy_core_prime_battery_mah.pdfIn PDF document text
    • http://fridgeservice.ru/2008_toyota_camry_le_owners_manualbh09j.pdfIn PDF document text
    • https://cdn.sqhk.co/litametun/dggifYC/kikupobatazotob.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/kIm1Ib1/wuxagixasoli.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/fhd4jbw/98416360195.pdfIn PDF document text
    • http://dronextactical.xyz/schedule_maker_templates_free_excelwxcf3.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/xZgiNgi/togodiwakavanukuvaf.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/grieSig/76241513862.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/HyjcicO/jubavikasodawol.pdfIn PDF document text
    • http://securityverifiedservices.com/9750605430m4cz8.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/traduire_anglais_francais_document.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/kiwopusafize/16879409761.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/wadazobezozoridipexese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54307bb-8e86-42a0-86c6-93f2220bd6a2/jexumumodagatimuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351b6dc4-59d2-4690-a0bb-f73bf720452d/what_to_eat_when_trying_to_conceive_twins.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/32312190068.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/fipabezibenowanefajizad.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/full_video_of_another_cinderella_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942edb29-98f2-4502-a79e-1ddbec6911c8/5892713421.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 5868 bytes
SHA-256: e9d472e016be107c64dcfdac67c50710c6de724890a01b0dc03da7d02f3a0e82
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 10580 bytes
SHA-256: ef152bbf3e57d683c81ee497397afeb244b7162abbf26ea52f4b9271a17b48d7

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