Malicious PDF — malware analysis report

Static analysis result for SHA-256 8631042fae870eb6…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 22:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 53ad5b7cfa946ab5a009148cd5452124 SHA-1: e29b1114618124c1d1bb37f153f651aa211c27d0 SHA-256: 8631042fae870eb6ad0449789cf0cd6184ff59ab4740de3b7bf1e7c93bb21915
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 hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://midufefew.ru/aws?utm_term=sat+tests+pdf+download PDF link annotation
    • https://cdn.sqhk.co/rokabumake/HjuNhhg/digasasagivu.pdfIn PDF document text
    • https://cdn.sqhk.co/bomenojosa/ihJBAia/yellow_backgrounds_for_phones.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/cea84595f4153a.pdfIn PDF document text
    • http://manovina.mypressonline.com/4907850401.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/gi8gdgh/glory_road_cast_assistant_coach.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/mTicHTB/adventures_of_orange_ballot_measures.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/iakdggF/netflix_movies_christmas_chronicles.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/giieEGS/66965899589.pdfIn PDF document text
    • http://foxinawolukomat.iblogger.org/lozenuw.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/how_to_reset_airbag_light_on_2006_chevy_silverado.pdfIn PDF document text
    • https://wuselusovofose.weebly.com/uploads/1/3/1/1/131164562/danifip_jusilozabas_vabiwojunawe_talaxagek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafexobaxe.epizy.com/dress_code_smart_casual_semi-_formal.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/dozopaxuwewumi.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/free_video_cutter_joiner_android.pdfIn PDF document text
    • http://pezusor.epizy.com/apple_iphone_app_store_apk.pdfIn PDF document text
    • http://lozepis.epizy.com/lsen_quadratischer_gleichungen_aufgaben.pdfIn PDF document text
    • http://faguvixin.rf.gd/20679369540.pdfIn PDF document text
    • http://roxudafemif.epizy.com/pefigapevuwijopu.pdfIn PDF document text
    • http://wowifimeziv.rf.gd/hiv_testing_guidelines_cdc.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_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 5132 bytes
SHA-256: 1598c0643502755cd7f99cef42bc931a81e2ca4aa189632390b989dc24db5005
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10856 bytes
SHA-256: f375aa381ea4b3faddc1eca528eb37701b677b552a061eb270041483b19721b7

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