Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8916d22f2d3ec18…

MALICIOUS

PDF

75.2 KB Created: 2021-03-02 02:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ed8e61e9c2a9b012cda2bd0f3fd3b85b SHA-1: b45428d7396a2e62cc63717f7a1a2f7678d449d4 SHA-256: b8916d22f2d3ec184f50460051206f5747f6c49e1a8a98c7b4f3175e890a67d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search query for 'merrill physics principles and problems answer key', indicating a lure to disguise malicious content. The presence of embedded URLs further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://jumiwimov.ru/wix?keyword=merrill+physics+principles+and+problems+answer+key PDF link annotation
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/kusatojatax.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/616171.pdfIn PDF document text
    • http://funanomofov.22web.org/articles_exercises_advanced_with_answers.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/tiniwaxivizaven.pdfIn PDF document text
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/nixonor-tovepedowefif-wanize.pdfIn PDF document text
    • http://gojepifega.22web.org/22249161435.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/ogeDLhh/london_rex_hacked.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/zabasopitox.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/0hjjb8w/raditibibafu.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/a37d401cf3f93d.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/lixite-jekalogib.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/6324738.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/v1hiheB/48662190977.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/filidabut/ginizebigi.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/tower_blocks_game_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/business_case_structure_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/m-audio_keystation_49_mk3_size.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/vidutu.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/the_vampire_diaries_season_1_episode_1_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/modal_auxiliary_verb_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/blank_invitation_template_ks1.pdfIn PDF document text
    • http://pibusobi.epizy.com/bodybuilding_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/solving_quadratics_by_factoring_worksheet_with_answers.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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 5716 bytes
SHA-256: 8853ec7869942467b0af4fd86d9f62101f72b5043cd224d0a45bbb3237319b92
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 10484 bytes
SHA-256: 751aebb9333cc7d5533f954d06f415c8831001e74c80ebdeae43f029e8345cce

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