Malicious PDF — malware analysis report

Static analysis result for SHA-256 116b9be3c5c93951…

MALICIOUS

PDF

75.8 KB Created: 2021-04-01 17:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3344c56b11eeddb45d5fcc720ff816a SHA-1: 231090e200ceced8114b7fa9864b84995e69ee11 SHA-256: 116b9be3c5c939519d967434c4fedd41ef6eb902a894018164ab54dc9fc49089
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. One of the extracted URLs, 'https://nipisod.ru/wix?keyword=apk+signing+v3', is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nipisod.ru/wix?keyword=apk+signing+v3
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/nugezexonazis.pdf
    • https://mimudoro.weebly.com/uploads/1/3/5/9/135961837/wotasifotajibixuduw.pdf
    • https://dubarepexax.weebly.com/uploads/1/3/4/5/134586846/f54f8.pdf
    • https://gikapatom.weebly.com/uploads/1/3/4/0/134042778/16464.pdf
    • https://cdn.sqhk.co/rodesedaded/bLgdKMJ/mezokaxojozilipiluxuduji.pdf
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/9766701.pdf
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/giwosisozepewo_lubiwum_xidad_nawowiw.pdf
    • https://cdn.sqhk.co/zoluxoni/f2jchej/wells_fargo_mobile_deposit_pending_time.pdf
    • http://zevixoleg.iblogger.org/comreg_quarterly_report_q1_2019.pdf
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/benuruxel-sakowokupefa.pdf
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/zijerewatij_gikekod_mokiraki_vipovarafure.pdf
    • https://cdn.sqhk.co/filemowa/bjjcJjg/lovelace_happy_feet_quotes.pdf
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/3db918027.pdf
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/899171.pdf
    • https://cdn.sqhk.co/pasededi/ihaJjjB/nike_air_force_1_07_real_vs_fake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zusevamasor/report_infringement_ebay.pdf
    • https://s3.amazonaws.com/zikeko/alcatel_one_touch_basic_phone_manual.pdf
    • https://s3.amazonaws.com/temujonuwu/zovenokuxemu.pdf
    • http://zogupavufun.epizy.com/zanatenoxijobefafojuwi.pdf
    • https://s3.amazonaws.com/fotepopunaj/sebenedowefegajamofuwe.pdf
    • https://s3.amazonaws.com/lezerawe/pesenadogusujijatijutafu.pdf
    • http://vagakidid.epizy.com/18460462730.pdf
    • https://s3.amazonaws.com/neviwove/3997101727.pdf
    • http://boxitevu.rf.gd/97621147955.pdf
    • https://s3.amazonaws.com/tulosa/casual_formal_dress_code_for_ladies.pdf
    • https://s3.amazonaws.com/lijulijowivaze/itemized_event_budget_template.pdf
    • http://wulimazef.epizy.com/vemolirukebubo.pdf
    • https://s3.amazonaws.com/sakaburepagase/9449259908.pdf
    • https://s3.amazonaws.com/jubiferekaka/90212286819.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin
21a0a65fd2fd1b6f65593c15835a0174343153f44cd854ba1b9b68534c42ef4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 4928 bytes
font_01_sfnt_off0000fc76.bin
bd724bcc5917231c3241a2512c817c2cf6df32600510b99e2504d496679c29c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10892 bytes