Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bad87ad7199897…

MALICIOUS

PDF

88.2 KB Created: 2021-03-03 11:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff6ee4da28f74fa4b981515c910b2f5 SHA-1: 59efefda4987e4970956a69c8f6b574f958ac953 SHA-256: 64bad87ad7199897b3ead42eec783aad2eba5cfe5f73782dfb6452c06ed7997d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=vikings+war+of+clans+mod+apk+android+1
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/1299079.pdf
    • https://cdn.sqhk.co/lawafopugu/DhgtlQb/11636018175.pdf
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/pibazuk.pdf
    • https://cdn.sqhk.co/kezavilageg/Xjivjfz/spirit_animal_birth_chart.pdf
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/lubube_wawikugijug_jowiwe_jazonadi.pdf
    • https://cdn.sqhk.co/rawatajizefu/jfHShjP/14125394595.pdf
    • https://cdn.sqhk.co/valujoper/ficrIxH/87536607756.pdf
    • https://cdn.sqhk.co/jenireni/ovoAhbP/smart_balance_wheel_price_in_kuwait.pdf
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/828082a02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buxamojajowolos.rf.gd/32934819021.pdf
    • http://gulesovel.epizy.com/technical_institute_website_templates.pdf
    • http://litegizixusiw.rf.gd/antikvariniai_kapirovskio_dantys_mangai_free.pdf
    • http://pefimubis.myartsonline.com/veg_soup_recipe_instant_pot.pdf
    • http://sezajuvijib.rf.gd/ssl_certificate_from_chrome_browser.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000121cd.bin
7ff4bf62eb56ece8b54d46ef184e3e0a71dbc471e992078c9b7012317db86479		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x121CD 27572 bytes
font_00_sfnt_off0000dfd7.bin
b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 2880 bytes
font_01_sfnt_off0000ea15.bin
b63ba69a3d658f7312d4b10e2b0b2f3f3d1e6d6c580a02ff0993db997deb314c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5648 bytes
font_02_sfnt_off0000fd57.bin
f9ef30298058675c480e9c0f8094008895bd32c276d705f1478617366a3afdae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10576 bytes

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