Malicious PDF — malware analysis report

Static analysis result for SHA-256 8708558f1e7c37e8…

MALICIOUS

PDF

67.2 KB Created: 2021-03-27 20:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7411991550dea62e6bacab3b35f74f43 SHA-1: e9dfe2ef997460d82e7f9aefb104dbedee79f812 SHA-256: 8708558f1e7c37e8ecebbe411d456644e210425a3c87d94ee9cc88efc4e18727
186 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 external links, identified as a link farm, with one URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=boss+baby+coloring+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374198/normal_60161121a1bc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fcccbf68d5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fe9237e25227.pdfIn PDF document text
    • https://mosutija.weebly.com/uploads/1/3/4/5/134502389/fupopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_605bcad2bc6f8.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/10271811920.pdfIn PDF document text
    • https://dofigova.weebly.com/uploads/1/3/0/8/130813881/47c9a248.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/6f879b07-2c8a-4cd6-b316-d6dbb7a3dbc7/jefupalomutudopopolej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d173e590-43b2-405f-bc9e-7e0457e34147/cia_assassination_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/1347502877.pdfIn PDF document text
    • http://goxabobuti.rf.gd/asfixia_perinatal_oms.pdfIn PDF document text
    • http://pezedavepajizum.rf.gd/gegojipepekof.pdfIn PDF document text
    • http://jowelipap.epizy.com/muramoroto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2381a100-1e2a-4a3c-935e-81a8eabbb563/sa_sports_fever_crossbow_string_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe99451-c985-4361-b1a3-62945c1ad744/31368660878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eacf4681-cd5e-41e1-be08-fbc115bca008/norstar_phone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97e27d5-9078-458a-9b80-621574109fe7/97332730840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d5d324-9d96-44fc-8127-78858bd2eac0/what_do_moon_rocks_tell_us.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/46059477985.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/zogemopekapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774c7ad1-f3d1-4b4f-93a6-4d049b38f4f2/nv4500_rebuild_kit_with_gears.pdfIn PDF document text
    • http://ketaxesam.epizy.com/autocad_2014_crack_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/29629253989.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/does_finland_have_the_best_education_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f01668-e0fc-4d89-bbf6-9783123a5b76/72636279152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7070f200-534a-4cd0-9658-eaaafa1d45de/rumelesutevizokasusen.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_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 5352 bytes
SHA-256: 87b29b39f1d482939054afe5bb1f03befabea728f268ae6d874f459507b9343c
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 9696 bytes
SHA-256: 88f0f6287c763b404ec9b3a75520059b1ae9886b93a1d102fd150e139d1b547e

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