Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb8002208cdc251…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 731eaf2ac89f7fbed8263b647d54975e SHA-1: 97551a75e93566a01196a0df78e647635ffed120 SHA-256: 4eb8002208cdc251a67c219a0408d42ff8f0defca0290d7b7a59032c75d02c07
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable infrastructure, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=where+is+the+spark+plug+on+a+toro+recycler+22 In PDF document text
    • http://robertferrell.net/como_validar_mi_titulo_de_ingeniero_industrial_en_estados_unidoshsway.pdfIn PDF document text
    • http://all-system7.work/gestalt_principles_of_perception_worksheetsqkon6.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/basiliroxu.pdfIn PDF document text
    • https://gufofusubovara.weebly.com/uploads/1/3/5/3/135323195/1679272.pdfIn PDF document text
    • https://sakaromef.weebly.com/uploads/1/3/4/5/134507496/3080056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60613702ac89d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5ffd801baa5cf.pdfIn PDF document text
    • http://kyrgyztours.com/99667345894c8xp9.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/mosupugu_muxolaja_puxiguwebetones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6024372220c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_5fda548a50563.pdfIn PDF document text
    • https://tibomomaludo.weebly.com/uploads/1/3/0/9/130969572/getajukogimixotojiva.pdfIn PDF document text
    • http://susurrus.space/lg_led_tv_service_center_near_meqmxcq.pdfIn PDF document text
    • http://topplafond.xyz/what_instrument_measures_air_pressureshf1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_6013925fa561b.pdfIn PDF document text
    • http://com-signto5.xyz/49935678292v0cgn.pdfIn PDF document text
    • https://verafilutawus.weebly.com/uploads/1/3/4/5/134597792/zofadow_nimalelir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_600318ff41520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_60140456cecfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_60269926df6d0.pdfIn PDF document text
    • http://ses-paypal.com/gofovinefoxugaxorajixosk81dq.pdfIn PDF document text
    • http://kvadro63.ru/60241829178zxtyl.pdfIn PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/zowejunitumoto.pdfIn PDF document text
    • https://zamivevi.weebly.com/uploads/1/3/1/4/131437513/b8bfaf1b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_60305f75bd6ca.pdfIn PDF document text
    • http://natural-shop.info/xorevexikifavmmp3.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/fe7711fe30f776.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/zotozajatebipekufamujx1g9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5504 bytes
SHA-256: bcc48e6298e4e226558896b0feea02df27026027d71348b873675fd44467a794
font_01_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 10376 bytes
SHA-256: 1cd2167636a46c1f9831727b86e68089fff0df8f2b559cc16b13f6a99a73ccb3