Malicious PDF — malware analysis report

Static analysis result for SHA-256 587df9d4a9796f00…

MALICIOUS

PDF

76.8 KB Created: 2021-01-18 02:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6617af69ce2503c5f909a622d8b6b209 SHA-1: d80533b622e37ec14f9e994028daa1f2f4231a34 SHA-256: 587df9d4a9796f00830c7c48cf648ba046580d48fba3ba9e2b9998eff36d66c6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', indicating a phishing or malware distribution attempt. The presence of external URIs and the link farm nature strongly suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=impulse+momentum+practice+worksheet+answers
    • https://kazenoti.weebly.com/uploads/1/3/2/7/132740362/13617de3b8ac.pdf
    • https://cdn.sqhk.co/tuzijaxab/igligsm/trap_dungeons_2_no_ads_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5f962c0bcda79.pdf
    • https://site-1176339.mozfiles.com/files/1176339/15797094154.pdf
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5fcdce49e7ed4.pdf
    • https://site-1250990.mozfiles.com/files/1250990/el_clasicismo_musical.pdf
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/murolepazu.pdf
    • https://site-1178153.mozfiles.com/files/1178153/wewafevemek.pdf
    • https://site-1200839.mozfiles.com/files/1200839/tatul.pdf
    • https://cdn.sqhk.co/duxapotor/18Uieha/smoky_color_parallax_go_launcher_themes_free_download.pdf
    • https://cdn.sqhk.co/pafevola/heNBJQt/25811481659.pdf
    • https://site-1168155.mozfiles.com/files/1168155/virtual_tour_of_texas_state_capitol.pdf
    • https://kabaposirivapej.weebly.com/uploads/1/3/2/6/132680813/57c15.pdf
    • https://site-1177382.mozfiles.com/files/1177382/91146736780.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f883c1d2b9eb.pdf
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/80958a9.pdf
    • https://site-1178858.mozfiles.com/files/1178858/36646177704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zubeleboju.epizy.com/46055426467.pdf
    • http://xakosafejel.epizy.com/bayern_munchen_di_pes_2019_android.pdf
    • http://bapexuzajo.epizy.com/58149833166.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_off0000e3c8.bin
4d00d9a42b8c0a6281c6f91ecd2d6619cfd6d2fee89e9d65d4cff6ecb559f56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 2856 bytes
font_01_sfnt_off0000edf2.bin
5a88e9db62924363dcd7125a75fa45462dbc2b84e2c504c200063ff469e34b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5268 bytes
font_02_sfnt_off0000ffbb.bin
163d95bf8eea455a02d105294f5d4252206bbd0b68c6115a503214769606adc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 11072 bytes

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