Malicious PDF — malware analysis report

Static analysis result for SHA-256 339d32e39e7330af…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 06:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd202a9fddef06dd6a2d3d18eb76d802 SHA-1: c35b8b3a9c60c8d9556bf016f9fc6ae8e652a030 SHA-256: 339d32e39e7330afafacce1aa1ec12c02212c1f59ecc02e261c36f1aeac79b61
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the ClamAV detection and ML classifier. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, likely to trick users into visiting the link farm. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=calculating+volume+of+a+triangular+prism+worksheet PDF link annotation
    • https://cdn.sqhk.co/molewekane/geihHja/63888854701.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6Iaj2oo/disaster_will_strike_4_walkthrough.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/6749482.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/ibibyhe/7783923398.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/if7jjMe/singapore_driving_probation_period.pdfIn PDF document text
    • http://ropejolun.iblogger.org/xiputesovozepoviwubilez.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/f2b5e13b4aa395.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/TOhihhZ/nick_cordero_waitress_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/phdzihh/captain_america_civil_war_marvel_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/7UbWjf6/globe_my_business_plan_1799.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/ponus.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/b0e783b.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/gcdjg9L/44852412693.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/lunojol/zizifipixokupebesikiroz.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/digojimuden.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/activinspire_game_templates.pdfIn PDF document text
    • http://bitinorakinin.epizy.com/88908658093.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/ac_dc_tnt_tab.pdfIn PDF document text
    • http://xosekipile.rf.gd/colocacion_de_cateter_venoso_central_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/best_rap_beat_ever.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/23912495420.pdfIn 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_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 5552 bytes
SHA-256: 161357a68f210e161186ccb9372a3a8ff61f12bd1590b4f8256d6d42dc8fc942
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10596 bytes
SHA-256: 05a7883423ac3ed7edd8f14e8629eee40a54965411575c151a47cbac504cb37d

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