Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e998b0ac1f5bd3a…

MALICIOUS

PDF

107.4 KB Created: 2021-03-14 08:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9319786239f44fefe0938107f05be08d SHA-1: 7d1244f2f9250544f43fdf8bd10ac8f6d930d113 SHA-256: 1e998b0ac1f5bd3ae304b2aa8cc44e16663e963e9fd4e1108c2d51acba0480fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=solving+logarithmic+equations+worksheet+kuta
    • http://lg-copyright.com/pajarodib0j46.pdf
    • https://cdn.sqhk.co/sekijebasazi/ii005ic/dosozelewikusi.pdf
    • http://firstdoctor.xyz/nogetaruminimojijukujigitcw7mn.pdf
    • https://cdn.sqhk.co/gojelonub/t8jbigV/votusidezudasunudatu.pdf
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/napefugimiba.pdf
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/5102536.pdf
    • https://cdn.sqhk.co/favosejo/mMjgPzj/revofebu.pdf
    • https://cdn.sqhk.co/kavejufa/cgiBibD/jiwonuzirininusuneni.pdf
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/dovokewogunijepopu.pdf
    • https://cdn.sqhk.co/simikimira/YOvjeji/slope_equation_with_2_points_calculator.pdf
    • http://eferevole.com/408657704611r9t7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedesisumi/geziluwomox.pdf
    • https://s3.amazonaws.com/papuja/48952937663.pdf
    • https://s3.amazonaws.com/woxorojero/cub_scout_logo.pdf
    • https://s3.amazonaws.com/baposivarabuj/setoxep.pdf
    • https://s3.amazonaws.com/zunaduxa/refawogununekalufejirewu.pdf
    • https://s3.amazonaws.com/latufenaw/thiwanka_dilshan_new_song_lyrics.pdf
    • https://s3.amazonaws.com/mokamoba/breezer_radar_pro_size_guide.pdf
    • https://s3.amazonaws.com/dogazisuze/naporusifimavi.pdf
    • https://s3.amazonaws.com/satudifin/31615522386.pdf
    • https://s3.amazonaws.com/takebemanijewok/formulierung_absage_angebotsabgabe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f535.bin
b91e73fc4d3c99b9bba5d8bec436101c1185d9b2c36eaf7c4073481ae8685d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 36792 bytes
font_01_sfnt_off0001674f.bin
c860d53da1d7a7a91c76e0a8f3980d1d1d6e0b9b7fcff53194fd446f18e43caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1674F 5660 bytes
font_02_sfnt_off00017a77.bin
46080270df5c12d6eb979fc97b208aa5b61d144da1f3cba922683524555e6830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A77 10856 bytes

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