Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ad878401f9b010…

MALICIOUS

PDF

89.5 KB Created: 2021-04-30 14:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 06374e5a1ce992268d95e40aa9aca4f4 SHA-1: c0a9a21e068bb53ecb206d03972cd18edf760087 SHA-256: a3ad878401f9b01029b8db1520272db76632e4887912b8b4fb0b89dd7cd4351a
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=app+store+sur+apple+tv+3rd+generation PDF link annotation
    • http://italystore.pro/wonozofuvufajikijagvyud8.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/fexubovikura.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/siloxijosobijez.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/kikozi.pdfIn PDF document text
    • https://dumasibomis.weebly.com/uploads/1/3/4/6/134642495/jufuwusebefokigipika.pdfIn PDF document text
    • http://arnautmebel.ru/67250767924y6wu7.pdfIn PDF document text
    • https://bativajo.weebly.com/uploads/1/3/4/6/134662657/ede771d94fdd6bc.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/bemixigu.pdfIn PDF document text
    • http://italy-small.space/cherry_keyboard_switches_typesi8fip.pdfIn PDF document text
    • https://zuzoperelalame.weebly.com/uploads/1/3/2/6/132683259/0963b.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/786390.pdfIn PDF document text
    • http://fitokapss.xyz/laurel_wreath_headband_template9to98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_fa423a1e750d4d2dbdf571ce564a5543.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/38408638642.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/1940063226.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_8d788d7d89df44c5ae1b7df36e032751.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/6167298717.pdfIn PDF document text
    • https://a943cdc4-551e-4fd6-8842-bb1c82e441e2.filesusr.com/ugd/a0303e_8d1eb65a2b5a4627b82f779a5aa05485.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/bissell_crosswave_pet_pro_2306a_vacuum_cleaner.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_f258f0ece5554d11b515c780214b7c9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/dream_meaning_pregnant_mother.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/pokemon_crystal_breeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/66140735922.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/bible_commentary_on_philippians_4_13.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 5340 bytes
SHA-256: eedaa51742ea424c10dcb517d94c6cc31933ec0ca0cb658f0727b512f64efb92
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 4496 bytes
SHA-256: edb7052808c9e44734364ffa04a0512db93c4c73f01056a3f60911ab8ae8b59f
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 11740 bytes
SHA-256: f30ba91c7dc5ca440c9a4e6abca1dd2f96303eab36a686008862d6aa9683be12
font_03_sfnt_off000142a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A4 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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