Malicious PDF — malware analysis report

Static analysis result for SHA-256 be727be0722e7e7d…

MALICIOUS

PDF

80.5 KB Created: 2021-05-19 23:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ab436fc8b3b8932bf54ec651eab2a60 SHA-1: a0fa4065135b754eb4770151a0f673e30c8d81a0 SHA-256: be727be0722e7e7df731f7b0016d44c7121a565f598899872e998eaf491c387c
156 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a mass of external links, with one prominent URL pointing to 'jacksth.ru'. The PDF structure and the presence of numerous external links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=the+outsiders+worksheet+answer+key
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/gijewogat.pdf
    • https://cdn-cms.f-static.net/uploads/4492575/normal_603fe3150bb77.pdf
    • https://cdn-cms.f-static.net/uploads/4385647/normal_6043044bdab5f.pdf
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/2aeadd63c3d3.pdf
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/5416148.pdf
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/26633ed60b.pdf
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/688c64c23adcb.pdf
    • https://bowasizavaxilek.weebly.com/uploads/1/3/4/0/134042597/345319.pdf
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/82004ef.pdf
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/e19c01c4b33.pdf
    • https://cdn-cms.f-static.net/uploads/4498992/normal_60510d516798a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d66bfa7-8442-4ed7-9376-09dfadb530f2/zuzunerowubovipewodasi.pdf
    • https://s3.amazonaws.com/divexikav/27730105313.pdf
    • https://uploads.strikinglycdn.com/files/9d103773-43ee-4e6d-90f7-1f985f42e5f5/how_do_i_use_cvs_blood_pressure_monitor.pdf
    • https://s3.amazonaws.com/pirofopafu/90564301561.pdf
    • https://s3.amazonaws.com/feborobegibew/deed_of_sale_template_ph.pdf
    • https://uploads.strikinglycdn.com/files/1a579ff2-5b21-400d-8eff-cc13d88bb8eb/xuzupefiperowawazirowuz.pdf
    • https://s3.amazonaws.com/xedewofuretujo/10026028148.pdf
    • https://s3.amazonaws.com/jikopot/avery_labels_8167_template_for_mac.pdf
    • https://uploads.strikinglycdn.com/files/b916d630-f68a-4e5d-b2b1-c140a7df2ba7/duct_tape_corset_diy.pdf
    • https://s3.amazonaws.com/netinuwa/la_la_land_epilogue_flute_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/1db95a7a-f633-4f09-9c40-b31c2645d1f1/maruti_alto_800_lxi_spare_parts_price_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafa.bin
660db245386059cceb56f9645e233b673a1f903933db3af5698e35bb7971b7db
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 5088 bytes
font_01_sfnt_off00010c55.bin
f3b84264b7ac5d4df98828abc8b119be3e23059f57bcede25640488ef5bb50ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 11792 bytes