Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeae9155b778a485…

MALICIOUS

PDF

92.1 KB Created: 2021-04-03 06:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b73d103c7bc71365d89ec097de3202b0 SHA-1: cbf2f8175275509ae7bc53ed7c3bebf8b4cc554f SHA-256: eeae9155b778a485eabbd249bbb4dd08ebcfb3d0c34db8ae735d6eac6c56e41b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm PDF. The document body, though heavily obfuscated, contains strings related to 'Allied telesis at- 8624t/ 2m manual', suggesting a lure. The presence of numerous external URIs, many hosted on disposable domains, indicates an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=allied+telesis+at-+8624t%252F+2m+manual PDF link annotation
    • http://fevozogu.iblogger.org/62212857753.pdfIn PDF document text
    • http://tb-films.ru/pure_substances_and_mixtures_worksheet_answer_key9uep3.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/why_wont_my_versa_lite_pair_with_my_phone.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/glencoe_geometry_chapter_8-2_answers.pdfIn PDF document text
    • http://dalilexusafa.22web.org/74307295595.pdfIn PDF document text
    • http://teachersaid.fun/cellulitis_idsa_guidelinesw79ss.pdfIn PDF document text
    • http://itash.space/355599619572tx9k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fd2aa5709383.pdfIn PDF document text
    • http://lerob.info/philips_remstar_pro_c-flex__partsgptkp.pdfIn PDF document text
    • http://siondez.ru/6927456401954aat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5fef9a75355b8.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/candlestick_patterns_for_day_trading.pdfIn PDF document text
    • http://wopizup.mypressonline.com/headway_beginner_4th_edition_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_603eb672dab5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/743b7c6e-86e3-4bcd-86d8-f9b93b8ec03d/fapumatedupaf.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_d06c91318bac445e81b9b991a8efdc84.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_272c2d3bc11b443db229861b602c9677.pdf?index=trueIn PDF document text
    • http://zapuwoz.epizy.com/79815070772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ceecfd0-f9ab-4bb1-b7e8-96eea5799f2e/guess_the_image_roblox_answers_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f593473-2638-482a-8aa9-4396aea3f0a0/12_days_of_christmas_lyrics_funny_irish.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_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 5500 bytes
SHA-256: bf0db88cf6359a425015263e74a32a5e140b6931707235e89e988231dfac8a77
font_01_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 15680 bytes
SHA-256: 5e0f1be440c199a364797ff06b04dff7a2f1df469f0a4696ba841396e58f96df

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