Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baaae50ecfcd784…

MALICIOUS

PDF

71.1 KB Created: 2021-03-24 00:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8bb1ebd0489ca02144fbd3b6349da21c SHA-1: 943d0523dd0aa3597d51ff0178a83064c7482f41 SHA-256: 4baaae50ecfcd784026c12ff55801063262be3d9cc3a22ef08ddc771e91481c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, includes keywords related to policy manuals, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=cms+benefit+policy+manual PDF link annotation
    • http://health2health.online/pulibawaganubutujikit8s45b.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/que_significa_cizaa_en_la_biblia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_6043f7577c07d.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/behaviour_modification_definition.pdfIn PDF document text
    • http://jokegave.mywebcommunity.org/13104475177.pdfIn PDF document text
    • http://duplicwcnj.space/vunosibufofuniwogeziduq02mf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_600bffd2a5446.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/bikamusodaxix.pdfIn PDF document text
    • https://pepulerizalumel.weebly.com/uploads/1/3/2/7/132740212/b24b4b7a2b4.pdfIn PDF document text
    • http://xovekofetovo.66ghz.com/transcribe_audio_to_text_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fca614c3ce55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fe0d856dabd8.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/9280555208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_60322b1b11c09.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/pavotasetln57.pdfIn PDF document text
    • http://hookup682.site/chiff_and_fipple_whistle_guidenjr28.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/duzokubejez.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/sokujod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/jurassic_park_theme_song_piano_sheet_music.pdfIn PDF document text
    • http://buwifojozoziden.atwebpages.com/molecular_geometry_chart.pdfIn PDF document text
    • http://gawukafiwinexi.epizy.com/heathens_tab_sheet_music.pdfIn PDF document text
    • http://fezixukuwoz.epizy.com/92371906193.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 5212 bytes
SHA-256: d6ddfa0dde48edee42a27941262fdb10d623eb3598c4ce13166f6ea60094688b
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10332 bytes
SHA-256: 360aa8fa03fd9962d3d314b40c66f593fe621a16752144b07cc813a6fdf24eb8

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