Malicious PDF — malware analysis report

Static analysis result for SHA-256 141a9da33ba034f7…

MALICIOUS

PDF

67.8 KB Created: 2021-02-13 19:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4e37300095dd3dfdf490bc97500c07e4 SHA-1: dd279c9f7c9dacc4afe8bb8cfa240f08c656f2e6 SHA-256: 141a9da33ba034f78902d49faa7e55bde9fdaaf43fedb7ee0a74d8f493b87b36
136 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, specifically the URL https://bologen.ru/123?utm_term=rohnert+park+bus+map, which is consistent with phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to trick users into visiting a malicious URL.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=rohnert+park+bus+map PDF link annotation
    • https://cdn.sqhk.co/dadirowuj/Qjbnbji/vusum.pdfIn PDF document text
    • http://segwaywheelchair.ru/1136168838ewgk9.pdfIn PDF document text
    • http://hookup153.online/pepevidakipevonesekegozeqzeqp.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/jjEmYGF/green_bubbles_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/lisojikefe/hghjLCU/light_ballista_osrs_max_hit.pdfIn PDF document text
    • http://usacreditscore.info/network_topology_bookaj5kr.pdfIn PDF document text
    • http://xozonline.ru/hip_hop_music_songs_download_mp33hdvp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wejuvono/sheet_pan_cashew_chicken_whole30.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/83227125317.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/formic_acid_wastewater_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/free_english_worksheets_for_14_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/meaning_of_satisfactory_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/sccm_icu_admission_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/geteratifemidafebupipug.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/autocad_architecture_2016_tutorial_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/xurififedewexowofe.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/mac_os_mojave_beta_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 5072 bytes
SHA-256: 51d599b0904ec803c495f6ec9c78fb4afe2220d923d0757b957aea8917b165e6
font_01_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 9732 bytes
SHA-256: d7db8ba7f950921f9e399454ff0e59c1ef90d21d3e276692a035266c4a3e6761
font_02_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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