Malicious PDF — malware analysis report

Static analysis result for SHA-256 e652011be3e1e89d…

MALICIOUS

PDF

77.1 KB Created: 2021-04-22 10:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ecdbdb7e7e256f3198001ed08f03f99 SHA-1: b442f97f81fd473ba654d8c65a2778b157f1f4b3 SHA-256: e652011be3e1e89d4a8c1dec8412c677a7c19b0535c77da2df311a040b81745f
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The document body, though obfuscated, contains a lure related to printer installation, directing users to a URL that includes 'how to install brother printer hl-1110'. This indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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-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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+install+brother+printer+hl-1110
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/miduvogigirevemix.pdf
    • http://xenogejewaruvi.22web.org/mogafibelovubevujaxe.pdf
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/vetit-gukew.pdf
    • http://jotijitod.66ghz.com/forrest_gump_theme_sheet_music.pdf
    • https://vesogotupu.weebly.com/uploads/1/3/4/7/134702950/metelivo.pdf
    • https://cdn.sqhk.co/lolajelor/gg8ifge/ar_effect_definition.pdf
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/pizemibanafemuju.pdf
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/67dbdd0ec2b.pdf
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/valesemazosafej.pdf
    • https://cdn.sqhk.co/zafilivopupu/dRihhhh/78958073633.pdf
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/8551610.pdf
    • https://cdn.sqhk.co/gekakisoduvo/Nlific6/jarekikipe.pdf
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/3269fc.pdf
    • https://nuwosalu.weebly.com/uploads/1/3/4/4/134497214/wuxafawanev_dabuzeremazepa_ritape.pdf
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/5480210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nalejunubotuw.rf.gd/costing_and_quantitative_techniques.pdf
    • https://uploads.strikinglycdn.com/files/f3777c54-6918-43da-9f3c-7c1c87a45377/love_you_more_than_you_meaning_in_urdu.pdf
    • https://uploads.strikinglycdn.com/files/e5bafeba-1d55-48f2-888b-005a56ef3c2b/letter_to_the_president_of_the_board_army_template.pdf
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_60480f4633414c4f9bce5f328ed3d95b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8396693c-bbbf-4543-b7cd-d67360569a5e/cannon_36_gun_safe_reviews.pdf
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_5c2b0714649e4a34a084ac09ea58c493.pdf?index=true
    • https://fff5164c-1337-4dca-a870-9ee8129e9d1f.filesusr.com/ugd/11cbe4_c815a64b27ec45638df2fe2635f6f8bd.pdf?index=true
    • 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_off0000e1bb.bin
304847db1a1808e015ae0e6dea6d8fab06e5d8bc28310c4b574e1834eb65d309
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 5112 bytes
font_01_sfnt_off0000f31f.bin
214a1f2055353a53655ea8725d1992b8422c34240fcf9acc70a861091acaa5f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 11500 bytes
font_02_sfnt_off000118b6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 4324 bytes