Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6b4521d08da40…

MALICIOUS

PDF

70.8 KB Created: 2021-02-18 15:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3dcf46623fe0909e9be7a93d7d9a889f SHA-1: a439852d650680ea6aae2e94ae90ad50c5b58c5e SHA-256: e3c6b4521d08da40c51e89707467a919d9079dc54857dc1de81d0155011b5691
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily corrupted, appears to be a lure related to an instruction manual, intended to trick users into clicking embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/wix?keyword=citizen+navihawk+instruction+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6021783bcc40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5fe826e820e47.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/bi6qgem/relexubufefubif.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/86b22ba7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5fe0d4968da0a.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/hifhcM2/28958610514.pdfIn PDF document text
    • http://kojibataruv.iblogger.org/descargar_guia_para_aprender_ingles.pdfIn PDF document text
    • http://montana-media.com/social_media_strategy_proposal_templatefzi4k.pdfIn PDF document text
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/688930.pdfIn PDF document text
    • https://tixiteto.weebly.com/uploads/1/3/5/2/135295688/tikawoneja-birokuj-wipagumenov-fapitolari.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/figasot.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/juzijigotolib-wutitagam-wewogijisodafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ffb8962cc882.pdfIn PDF document text
    • http://womenita.fun/kuensel_calendar_2020uq2ld.pdfIn PDF document text
    • https://cdn.sqhk.co/xejarirep/e5YvhcX/nonuxivavuzagale.pdfIn PDF document text
    • http://huaweistoreukr.xyz/4533505078476b1g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guxosa/2495851169.pdfIn PDF document text
    • http://kipixuge.epizy.com/juxowuvob.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/reclast_medicare_guidelines.pdfIn PDF document text
    • http://wawopuviginase.epizy.com/5530045453.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/82145807685.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/40381806111.pdfIn PDF document text
    • http://sesoxevanadike.epizy.com/ballerina_cartoon_video.pdfIn PDF document text
    • http://manisamat.epizy.com/gabuxujofiduzevepe.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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 5212 bytes
SHA-256: d12c018a0ac2f941e88dbe68797b0ce3a3f1b6191f197cf23ac475e350d587b1
font_01_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 10452 bytes
SHA-256: 912f13b4a650e87e1be2a4c93d7d8032136861791dc84b16c605b12e722200d1