Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea35f9918117724…

MALICIOUS

PDF

85.5 KB Created: 2021-03-15 23:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc66e53cc8828756308a670609d5b87 SHA-1: 1be2b6df7c18fa245706267e314de71729806824 SHA-256: fea35f99181177247e238c25d3c62be6aa6e324178d0b204872c5cfd4ffa5977
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files hosted on services like Weebly and sqhk.co, suggests a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=how+to+write+a+self+appraisal+report
    • https://mozokidadivu.weebly.com/uploads/1/3/1/1/131164210/wegakobobasetutipu.pdf
    • http://speak4pro.com/formtec_labels_guidezkrnk.pdf
    • https://lirigudufov.weebly.com/uploads/1/3/0/7/130776684/tamajirewa.pdf
    • https://cdn.sqhk.co/vanatuwo/wUjdVjD/gonapotolil.pdf
    • https://cdn.sqhk.co/wazafanez/hashhgO/skyscraper_stack_builder_apk.pdf
    • https://demegokesikamo.weebly.com/uploads/1/3/1/4/131454383/gavimir.pdf
    • https://cdn.sqhk.co/keliziniw/iwWghAl/fog_of_war_the_battle_for_cerberus_guide.pdf
    • https://cdn.sqhk.co/dupeguwova/bDjbT29/heart_starts_beating_fast_while_sleeping.pdf
    • https://cdn.sqhk.co/nizufalagef/2URfiib/solateg.pdf
    • https://cdn.sqhk.co/lomasamube/GieNBhc/91249583126.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/vosejirafexorer.pdf
    • https://cdn.sqhk.co/dafisuwikib/hdidiij/ww2_strategy_commander_conquer_frontline_walkthrough.pdf
    • https://cdn.sqhk.co/zipodumup/jhhhdji/bunk_beds_with_storage_drawers_underneath.pdf
    • http://copyrighthelp.info/87827079273umcvn.pdf
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/8574a.pdf
    • http://lollipopa.online/what_is_the_best_project_management_approachdf16y.pdf
    • http://wersita.space/grandma_and_grandpa_country_songx6a4l.pdf
    • https://cdn.sqhk.co/mevazasid/gjhhiiu/nenoselo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tuxutedi/business_english_pre_intermediate_worksheets.pdf
    • https://s3.amazonaws.com/jutenojamega/navuxavilarub.pdf
    • https://s3.amazonaws.com/vavebufevodutob/87366988583.pdf
    • https://s3.amazonaws.com/penale/72733610622.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b7.bin
f5b9c1845575a42ea7125e4feaaca836547fb0ea526d11ab70fbb4574115cc15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 4632 bytes
font_01_sfnt_off0001148f.bin
342f4d817f98ed84e769751c888ae3f2d637a9566e26b8b34237cc13ab706aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 11120 bytes
font_02_sfnt_off00013aa0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 4324 bytes

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