Malicious PDF — malware analysis report

Static analysis result for SHA-256 37738d1a0fd88f35…

MALICIOUS

PDF

74.2 KB Created: 2021-03-07 15:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 204e779ad65814339b04d2a37c059ddc SHA-1: 90bad6a7b5ac482af95cccf5ee1ed6126b9afbe3 SHA-256: 37738d1a0fd88f352bf9aef550ea531661f0bf92eb588453956b8ebedf03369c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a lure for "congruent triangles algebra worksheet". The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://jumiwimov.ru/wix?keyword=congruent+triangles+algebra+worksheet PDF link annotation
    • https://cdn.sqhk.co/pasepizut/QCgghfw/alien_blade_runner_predator.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/3a9daa85274b4cd.pdfIn PDF document text
    • https://cdn.sqhk.co/busunava/gg1jbgc/booking_revolution_pro_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/icJa6ii/hello_neighbor_toys_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/geibnjg/93730171537.pdfIn PDF document text
    • https://fomofasagulak.weebly.com/uploads/1/3/4/8/134860280/sobuxolam.pdfIn PDF document text
    • https://cdn.sqhk.co/tizadufof/hadjdN3/77544797451.pdfIn PDF document text
    • https://palejuzuz.weebly.com/uploads/1/3/5/9/135959315/tujovet.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/riemqia/boxigefotume.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/DPjagff/chocolaterie_stam_cedar_falls.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/gfGghjr/d_day_beaches_tour_from_bayeux.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/dgggegQ/19489758825.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/jaibPKV/rariz.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/wgehggh/bell_bottom_jeans_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/lCAifig/memifelorezokaxozigoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/Tjhjchc/35258959895.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/haiioQv/guzovufizomimebo.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/hRhguTo/mumutorosuxufos.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jhPidHz/ivry_sur_seine_paris_metro.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/WDiaOge/riloruzik.pdfIn PDF document text
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/pazad_kijubutesozox.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/tolivajupeku/30630079866.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/epson_wp-4530_wifi_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/appli_bfmtv_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/66559444181.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5148 bytes
SHA-256: 36ab020be8e8f0532d134cd0d8b9f3c2b5170341ef7718f8790ad0c622dd69f6
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 11076 bytes
SHA-256: 792ac6cec14c4efb58a55942a5053acd145bbaedbc9bc4958ee720a86161a2bc

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