Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5103e8a195053d1…

MALICIOUS

PDF

80.2 KB Created: 2021-02-22 21:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f2df25c656bcf96542bad1d8823c2891 SHA-1: 7d3de066d50a7cc06a823e70a67fb2d027e7b31d SHA-256: d5103e8a195053d10e05af6c951f901f181f1ddf102e359e4820e874b2e230e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted from this sample, but the presence of external URIs and the overall detection profile suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/strik?utm_term=sony+hdr+cx240+camcorder+review PDF link annotation
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/4448300.pdfIn PDF document text
    • http://toleritikujomuj.22web.org/notowikejofex.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/7khb77k/10413581493.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/7jfihgW/bavarenujatijija.pdfIn PDF document text
    • https://palavelo.weebly.com/uploads/1/3/4/8/134891967/36034.pdfIn PDF document text
    • http://xevoxisukima.22web.org/zunodofugegeguxex.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/7hcjggc/13677432189.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/f113f.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hhjeaje/fuwavipatakikimupap.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/grimvalor_apk_obb_unlockedkinp1.pdfIn PDF document text
    • http://zejotiwerukunut.iblogger.org/van_de_graaffs_photographic_atlas_for_the_biology_laboratory_8th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rugupodat.epizy.com/anticonceptivos_orales.pdfIn PDF document text
    • http://xelidamos.epizy.com/ciena_3930_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/eclipse_to_intellij_cheat_sheet.pdfIn PDF document text
    • http://wafibajew.epizy.com/95998872182.pdfIn PDF document text
    • http://vegewamofuxa.rf.gd/in_a_crowd_of_thousands_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/fpsc_jobs_challan_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/97148666684.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/96781860962.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 5464 bytes
SHA-256: 43c09d6ae737cd64bc87b5e3474133b033d9677504b688baff1763d0291d8d19
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 10232 bytes
SHA-256: 9a102916b1eeff9fee45ac10850096f108cf858b699b0fc10b62842682d1bbc9
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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