Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7527473afd6c946…

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 21:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a6d2184f4622f0c6c39d44ad38264a80 SHA-1: b667de0f232a511f13d63f311a02b432ff7d411e SHA-256: d7527473afd6c946d4662641199397c4fcd9afd432f8df73cbf9ec2d7b814ba8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'English grammar books for beginners pdf' and the wkhtmltopdf application, indicating a lure to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://golowaki.ru/award?keyword=english+grammar+books+for+beginners+pdf PDF link annotation
    • https://sududonoli.weebly.com/uploads/1/3/4/9/134902305/fcc95a1df7c90be.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/Pjchbif/arunachalam_tamil_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/mcjhhea/inote_style_i-_os13_apk.pdfIn PDF document text
    • http://sayseedokg.com/why_wont_my_gas_stove_burners_lightp0jqv.pdfIn PDF document text
    • https://revininone.weebly.com/uploads/1/3/1/3/131380081/woruzovudulexame.pdfIn PDF document text
    • http://energierecrute-emplois.com/344579411628ngn7.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/burapaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/hhiihb4/lyrical_lemonade_shoes_jordan.pdfIn PDF document text
    • http://sfr-espace.best/352395820646j7mz.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/absceso_hepatico_etiologia.pdfIn PDF document text
    • http://nashremont.site/smile_emoji_imagesrzzks.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/1ec25.pdfIn PDF document text
    • http://yoptan.space/monolith_dkp_guideczk41.pdfIn PDF document text
    • https://cdn.sqhk.co/bezizafosu/dhhgeGi/youtube_movie_maker_mac_free_download.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/nenogolisezejinoj.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/1e75e29743.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosemubo/YhgsE3W/20660410961.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/jodabiladezot/difference_between_layer_4_and_layer_7_firewall.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_908d8d3658f84242a3525a5ca2d88461.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povodijirig/dibikutigeseno.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/nuxedefovufebofulukujufol.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_e968dbecc04b47ce86f3f057575cce4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/how_to_change_a_primer_bulb.pdfIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_ab82c9cb9155441ca432882458e520ae.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_9e9ea1253e74489780860831f2a510ca.pdf?index=trueIn 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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 5616 bytes
SHA-256: 5aeb11cb3b11992cf0abb432a75653b30a6366f5eac669d4375e33e34a0972b0
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 11252 bytes
SHA-256: 12c5b3ffa4a151610710ceb462eaa7c65ba731bc9a840eddd7769e9172997c46

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