Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1f6c16a10a6ce…

MALICIOUS

PDF

86.8 KB Created: 2021-06-01 13:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 923a247e4fd89e4e2a049c900af87cbd SHA-1: d5ad47664b53c7dde9873c62c20f6b558ed1db8c SHA-256: d8c1f6c16a10a6cea37df560a3c35e091d6379ee897c80980a51c4e2d5cd1f10
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious activity.

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://lozipotod.ru/123?utm_term=aulas+de+ingles+avan%25C3%25A7ado+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404514/normal_600f1f9989dcc.pdfIn PDF document text
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/zagemuku.pdfIn PDF document text
    • https://zutuwukesid.weebly.com/uploads/1/3/4/6/134624341/niriwefuxoramizuroga.pdfIn PDF document text
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/5273085.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff003f3132a4.pdfIn PDF document text
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/d2b65d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_603fcabe69b85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feteselulo.pbworks.com/w/file/fetch/144441381/yth24k48_oil_capacity.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/mulojukosofoxozuridusup.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/dr_eggman_mean_bean_machine_online.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/pofufovikogagu.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144441156/flower_girl_dress_pattern_free.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144427101/16763376020.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144444579/abbyy_transformer_2.0_serial_number_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e942edae-145a-4885-9264-e45e610c6804/20752648544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc3b2f7-ae4e-4320-bc8f-ce7f0f8627a6/alex_rider_cast_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b01aa57-031e-4c25-bab5-0de375507c69/nwn_prc_builds.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/diary_of_a_wimpy_kid_old_school_quizizz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a857cd-cd74-4079-ad1e-f5cdb6f42fe2/35643375485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c996a754-8870-4eff-bae2-9a526986fa32/angelcare_ac401_baby_monitor_instructions.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_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 5344 bytes
SHA-256: 88f75eef6fcdd82dae5447d2095842c25ccfe7626f9718049106685aa0b37857
font_01_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 12900 bytes
SHA-256: 414b8c6daa188c2052d9a8905696a62e3a240663f701c0338b38703bc5a147c0

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