Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaad3d8ec1b887d7…

MALICIOUS

PDF

78.1 KB Created: 2021-03-31 07:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49fc0f876873b0367a3d11d796c8376 SHA-1: 271f2ddada4b28b27320ddcdbe4dac1638633e19 SHA-256: aaad3d8ec1b887d7d708a029f50401871c4966790cbe8eb6fdc790f27538c123
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://jottigo.ru/strik?utm_term=contra+iii+game+genie+codes
    • http://astropsychology.website/kawasaki_jet_ski_engine_identificationfg11m.pdf
    • https://cdn.sqhk.co/jimumakevaji/pNcwjhT/world_empire_2027_mod_apk_1._7._7.pdf
    • https://xovewelokajefi.weebly.com/uploads/1/3/4/8/134864882/rixitogidaf-rozojufotumaj-gigaxekit-vopaw.pdf
    • http://salea.site/genie_intellicode_chain_glide_remotewbago.pdf
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/e617bcab.pdf
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/553a97acb94666c.pdf
    • http://shmelev.pro/18969807472m7sur.pdf
    • https://cdn.sqhk.co/furabafezuse/Ujaighe/zombie_west_dead_frontier_apk.pdf
    • https://cdn.sqhk.co/sivadapexiri/d8d3WPR/38174489238.pdf
    • https://nodepinanobepex.weebly.com/uploads/1/3/1/3/131381288/52cd5124.pdf
    • http://pagebake.com/liloniwofief890.pdf
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdf
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/tipitezugul.pdf
    • https://demepeli.weebly.com/uploads/1/3/4/6/134632839/nojubokasaxo.pdf
    • http://wekeb.space/jinoditulasix9598.pdf
    • https://cdn.sqhk.co/devisofage/chbzhiA/koteruzamozejeno.pdf
    • http://siruvikeno.22web.org/baritone_uke_chord_chart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_e0ebc9663d004e6cbac074da70061062.pdf?index=true
    • http://kobukapun.epizy.com/android_games_free_online_play.pdf
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_c2535d5031b143d9ac49490cb7afaf0d.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_0c955ea27b6b4fc2a82433de30e29448.pdf?index=true
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_162470fa49dd4d69a5e718085c63751f.pdf?index=true
    • 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_off0000f365.bin
b1202b1950743072e40ceae2acffa02956f66bcb029b809f1441f051d0d0bc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 5132 bytes
font_01_sfnt_off000104bc.bin
5999b85a3fc097d8477131aa347953f4b5aaee5ba473e5ae7e294fd74df2cabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11332 bytes

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