Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74a984cdc015f57…

MALICIOUS

PDF

76.8 KB Created: 2021-02-10 07:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bbaee8ba2f62811e3ad8922acbb395fe SHA-1: 0407125245565a6be403bbc3f987f08a71a44e3e SHA-256: d74a984cdc015f5703a1f92f722f959008f19f955da363855ef8940e005257fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 embedded URLs, with one prominent URL pointing to 'maypoin.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to downloading content, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=take+me+to+church+download+mp4 PDF link annotation
    • http://muzotom.22web.org/zorizapejimuwur.pdfIn PDF document text
    • http://mritzoliver.design/basic_home_budget_spreadsheet33zd3.pdfIn PDF document text
    • http://pop-marketplace.ru/planet_of_the_apes_1968h5f6w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fddd9a2bf5f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_6015c98b6897f.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/scout_badges_on_uniform_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fe9378532bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_60233b3927d50.pdfIn PDF document text
    • http://nokuxitajorox.22web.org/bhojpuri_video_gana_hd_2018_new.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_5fd76deb60cbb.pdfIn PDF document text
    • http://look-hotel.com/11025723530hlmt0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakafemapekumu.epizy.com/bartleby_el_escribiente_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/naming_ceremony_invitation_template_free.pdfIn PDF document text
    • http://jifunujori.rf.gd/champion_korean_movie_2018_free.pdfIn PDF document text
    • http://wixilapawatos.epizy.com/plural_possessive_nouns_worksheet_answer_key.pdfIn PDF document text
    • http://vulusopotu.epizy.com/andrew_bolt_report_sky_news.pdfIn PDF document text
    • http://sivakekixil.epizy.com/decimal_to_fraction_conversion_sheet.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_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 5328 bytes
SHA-256: d257f6a75025d90ec4769819489684c4203964c5b890839eff78fdcf1ce050c1
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10700 bytes
SHA-256: ab698df0597adc205f9a99cc6ae2690f0ddbc3d54116c1c3cf33773da0a179e8

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