Malicious PDF — malware analysis report

Static analysis result for SHA-256 919778f43f50379d…

MALICIOUS

PDF

70.3 KB Created: 2020-12-17 14:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85bd89a927a9dbc1a4784972302ce967 SHA-1: 1372eedd14c515d634251327fb6388ad9f373ad8 SHA-256: 919778f43f50379d592da274fcad5d796c913a56aa3d869a380fbf8962b22307
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://traffine.ru/strik?utm_term=taco+bell+taco+salad+carbs+without+rice', which is likely used to direct users to potentially harmful content or for SEO manipulation. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=taco+bell+taco+salad+carbs+without+rice
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/tiwomifeb_vufojodiku_suxefalujeporek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0551173fb5383b68c16d/1606288721577/bakersfield_californian_newspaper_archives.pdf
    • https://static1.squarespace.com/static/5fc4cd580a2757459bfbf001/t/5fc620603c6ccf69f3305892/1606819936805/85371750872.pdf
    • https://static1.squarespace.com/static/5fc2adf9abaecd33182da937/t/5fcc97bfd235d37878c09ef8/1607243711775/95649237496.pdf
    • https://static1.squarespace.com/static/5fc688e8df132613bbe46c88/t/5fce58df920f47545bc4cdff/1607358687600/angry_snakes_unspeakable.pdf
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc110069b1ed0353801369f/1606488071229/jp_dokkan_apk_ios.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4fa52dd96f5918e535ec/1606373286356/jasuvaj.pdf
    • https://static1.squarespace.com/static/5fc11355ab79f442f22aa123/t/5fc26f08eaf37e3b64eaece2/1606577928652/29072124227.pdf
    • https://static1.squarespace.com/static/5fc3b7d50a2757459bf48cbe/t/5fc6954e3c02f22b9df32a83/1606849871663/throne_of_eldraine_spoilers_mtg_salvation.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4b815147b14804296123/1606372229185/juluxowerujasetet.pdf
    • https://s3.amazonaws.com/mixanaz/changeling_5e_guide.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5932e18c5c478ef33483/1606375730819/38384241992.pdf
    • https://s3.amazonaws.com/tugumeb/application_for_employment_template_australia.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1d7ca43b1e174043562d/1606229375924/a_long_walk_to_freedom_bangla.pdf
    • https://static1.squarespace.com/static/5fc70934a3ccef3526e90d89/t/5fd60b9aab1a676c72845d35/1607863195748/perforated_sheet_hole_size_chart.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56f.bin
b8535dd985e7064a27610cba51a7692bb380d76aa61ca29fc02ca499997e041e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 5208 bytes
font_01_sfnt_off0000e725.bin
2b3f5547676f97c40f4f42482ec03392cb259603eb037e0329bb5d713c0856b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 10856 bytes

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