Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b849ab8f519726…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 12:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 99ae7c8e65562630e3ad043dd71c16d8 SHA-1: 9f6aef44c03f6eda20a53eef6299f81c2c321ca1 SHA-256: 89b849ab8f519726c378b3bbcc918cfebf74879da55041d84be66870c2e6d676
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high heuristic score for being a link farm on disposable hosting. The embedded URI `https://midufefew.ru/award?keyword=applied+anatomy+of+lower+limb+pdf` suggests a lure to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/award?keyword=applied+anatomy+of+lower+limb+pdf PDF link annotation
    • http://patolul.iblogger.org/kokezufadututovozidakaro.pdfIn PDF document text
    • http://8gusevshop.website/wuwejatuwopolezstszr.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/undertale_hopes_and_dreams_viola_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/fezuvepere/sVicdic/pokemon_cards_worth_money_not_first_edition.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/rivej.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/gfgGRb6/71090685928.pdfIn PDF document text
    • http://powerpoint4you.ru/universal_audio_apollo_twin_mkii_quad_usb02zcw.pdfIn PDF document text
    • http://lonewawojelos.22web.org/dipilifiruwesiketadiri.pdfIn PDF document text
    • http://regvoolkim.website/wigosuxedow9zc5.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/ijbjjgc/3_point_percentage_nba_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewikomiwuzi.rf.gd/wurasovojituxuwadagumi.pdfIn PDF document text
    • http://puwuxotori.epizy.com/bexudelo.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_1ccf4c4e13d74993bc26dac16e528442.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b1de04b911ac4b69a3f9ca0d370b0de0.pdf?index=trueIn PDF document text
    • http://nugafafekovad.epizy.com/fleabag_season_2_parents_guide.pdfIn PDF document text
    • http://xujekodade.epizy.com/86506902223.pdfIn PDF document text
    • http://xuxusemo.epizy.com/luwomagedinipepafenupugej.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_811de4c00403430b9941b91f5ace200b.pdf?index=trueIn PDF document text
    • http://saxogif.epizy.com/87486869753.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_e21168a927f44062bd89c57b9527dd8e.pdf?index=trueIn 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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5332 bytes
SHA-256: 596f76fd4475358d8a3ffeab60d337f07a9070b77ed5dd353ac3cc3d43ae9f25
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 10208 bytes
SHA-256: 6eaa5d3475a460dae2364729aaf700e9b9f763a1ff60f5f04b080d57e44b682f

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