Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccb2dc525e857e8…

MALICIOUS

PDF

81.6 KB Created: 2021-05-20 03:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 68b99303d0abf790125456a782508197 SHA-1: ed364311d97fc7f1b2f34dfd96e731d0e1f1e1a5 SHA-256: eccb2dc525e857e85e5da700c60749e7b5a7b10dc013e0e952e119e32ddfe30d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO poisoning or phishing. The primary external URL, https://bologen.ru/strik?utm_term=dna+coloring+worksheet+answer+key, is likely part of a lure to direct users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/strik?utm_term=dna+coloring+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6024ca6eeb04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_603fee8ee170c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc5c98058dcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ff29ec3c6429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600ef4dace84d.pdfIn PDF document text
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/9142861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_605583c7bdcc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fda5703bc69d.pdfIn PDF document text
    • https://balimalovi.weebly.com/uploads/1/3/2/7/132710770/bidosivovit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_600f9006b644b.pdfIn PDF document text
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/2021920723fbd74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_60564836325e8.pdfIn PDF document text
    • https://gabozagabu.weebly.com/uploads/1/3/4/5/134506959/nogij.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/6366a.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/a1e1e0fa-6a15-47f0-a057-303a8257d01b/41138089316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4f3ec0-8eeb-4b3d-80a8-917902612b19/can_you_require_employees_to_test_for_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b9bdd9-cada-440b-8e70-fa9833f03b2b/89729217186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a71dca0-4d1c-4c73-9b0c-f6853dee107f/fantastic_fantasy_football_team_names.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/free_printable_flyer_templates_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119e7ec7-b704-491a-a99f-2939a39e6d72/27078596894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2eb6ee-bf66-44af-a160-fea0e8a326c7/champion_trap_wheelybird_2.0_auto_feed_with_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/how_to_polish_metal_using_a_dremel.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/aium_guidelines_breast_ultrasound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c359e1ea-975d-45f8-b1c3-02d13ca791da/suliveseromigakosude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53ff971-70b6-4813-96fc-81bd1ae5770a/50208325580.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5320 bytes
SHA-256: 45df4bfcabd65dff2100bc799908c1c402b6775ec1a83f65631cd34a40d122c9
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 10904 bytes
SHA-256: 88d8099ec6963ab5af24c434e4398416e553a1cbd96a5e4df5065d1675407607

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