Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1764e16da4d1d04…

MALICIOUS

PDF

86.7 KB Created: 2021-03-10 10:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d275f4295634d11adf3431fde4306d01 SHA-1: 0a8e22cf89d1d193cc03bf9271a67fdc5345ce01 SHA-256: c1764e16da4d1d0496c9fb4612f6652e5bd040c87e1d4e037d4716a407a3c950
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/aws?utm_term=who+founded+progressivism+in+education PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fee6ad7696c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5ffa690787dc6.pdfIn PDF document text
    • http://fubawubu.22web.org/bleacher_report_ncaa_picks_week_10.pdfIn PDF document text
    • http://saluzoz.iblogger.org/off_balance_sheet_em_portugues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_60334e3994e1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469126/normal_5ff1daf04ade1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_60020b913fde5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5ffd5283d53d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_602921c095f11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ffbc3fcc9001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389080/normal_5ffd52aaaad79.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/539aa61a-128d-4076-800b-d1d03f1f0dbe/midi_to_sheet_music_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/desalap.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_21233012594a4410abb5fd6829023152.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6909e3-6f61-4f1e-8638-3115aa449561/ziretajuwudip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525c0739-bac2-4d45-b45c-f189c51ab3f3/how_to_clean_ge_microwave_charcoal_filter.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_71331776644f4406ad26d5a382228dcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/kannada_janapada_song_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/video_boboiboy_galaxy_eps_24.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/majesty_by_peruzzi_instrumental.pdfIn PDF document text
    • http://ropurudowilume.rf.gd/kujakejujemu.pdfIn PDF document text
    • http://zobatokuvanoz.epizy.com/lubunosufewek.pdfIn PDF document text
    • http://gagelenobom.epizy.com/12757752929.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_922c009418be4dca82f20c61d90ce3e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/b._i._m._s_full_form.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_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 5608 bytes
SHA-256: d52c9730f5291cb5db44d39e1d830fb371ad41778761b78fc25c09dc04746b6e
font_01_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 10432 bytes
SHA-256: 5847870655ab40e700d5fd5c812fd6fc9eb90d57648c1ea3ed5486fbf8c2b497

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