Malicious PDF — malware analysis report

Static analysis result for SHA-256 a938e590cf8a27fa…

MALICIOUS

PDF

81.0 KB Created: 2021-02-18 13:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e4c5b27d396dffcd0ee83046be3699b8 SHA-1: 262f37d72ee16b5916d34c4da597d8720933a3cb SHA-256: a938e590cf8a27fafa395f9d8cfda3c88757ce28ed629a29a38fcdcbbd089b85
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://maypoin.ru/aws?utm_term=bsa+digital+merit+badge+pamphlets PDF link annotation
    • https://cdn.sqhk.co/pimidima/hhCjfcW/fomurafapupavejevaboja.pdfIn PDF document text
    • http://helpcreditscore.info/do_pink_pregnancy_tests_have_evap_linesqrb7j.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/jFghcMz/best_roadside_attractions_illinois.pdfIn PDF document text
    • http://ru-1.casa/57387805940nv3zw.pdfIn PDF document text
    • http://lovemecompletely.com/63095292858bj115.pdfIn PDF document text
    • http://idealica-ordina.site/napawoxeregaxuvemetaketaf0l9yo.pdfIn PDF document text
    • http://helpverifedbadges.com/kill_team_8th_edition8ldey.pdfIn PDF document text
    • http://limons.space/adblock_software_freenaar2.pdfIn PDF document text
    • http://requiremcgood.com/gelulutevevofogig58ov.pdfIn PDF document text
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/9306324.pdfIn PDF document text
    • http://medicalpracticementor.com/crv_car_reportct5hm.pdfIn PDF document text
    • https://wajonurogizi.weebly.com/uploads/1/3/0/7/130738566/rusuzuto.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/5bpujdl/tokebevunumamadavaxuza.pdfIn PDF document text
    • http://crubr.space/wixofopufovulamuwiwadevufg6vkt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nigabosepa.epizy.com/18938358326.pdfIn PDF document text
    • http://jonivobo.rf.gd/9716747781.pdfIn PDF document text
    • http://gazisemodab.epizy.com/kodabapudapixeganak.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_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 5564 bytes
SHA-256: f19f7c4f7751cea521bf1e6259536e1a73219913374e5339dba29ee57779b12b
font_01_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 12644 bytes
SHA-256: 4463b64733b2c0b065b4108e718016d35bc8418ac51a3b633fca1c6bff1527ed

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