Malicious PDF — malware analysis report

Static analysis result for SHA-256 7baebb86125d74a0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-17 18:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aec72011dae9fa181422a70399bb5c02 SHA-1: 5c592a6909ad94c40e9e5275e3683ed691e53410 SHA-256: 7baebb86125d74a08c4a3ff1435618575e161731c989adc0a60483b006329a1f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. One of the primary URLs leads to a phishing lure for a game modification, suggesting a social engineering tactic to entice users to click on malicious links. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/123?utm_term=hungry+shark+evolution+mod+apk+file PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500877/normal_602ed58069c1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5fdfc17b2fa46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_601c5c993a890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fe8571779aaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_6046900c92fad.pdfIn PDF document text
    • http://mavavuvew.22web.org/kakariko_village_sheet_music_clarinet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_a6e2373bc90e4051854d8fe45f347f69.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_bbe7469d7b7d43308b8f51a4974b386a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efa86e4-3481-4738-adac-d8ac9de48df6/jaluvusofubewasafonemitak.pdfIn PDF document text
    • http://vigopul.epizy.com/barbara_brennan.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_f5d1fc25469f4be0a5e0f143757dca0b.pdf?index=trueIn PDF document text
    • http://jowabew.epizy.com/pevug.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_7ceb6b2291b0483db2c85a36070e71f8.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_80f3d8148752464eb6b3bc0388529109.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad9dc4a-e490-411c-a2c1-bade3f341f94/citizenship_in_the_nation_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f1e22a-6568-4d8e-bd55-c0cd5fccedf3/what_is_the_sky_remote_code_for_panasonic_tv.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_f3fe690737574d7e9b5999fc5710b70a.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_c2cba6bab56b46ad87e95a9e6385f24c.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_fb4c696f8d9242ed8eaed8436c2efa3f.pdf?index=trueIn PDF document text
    • http://lamiredej.epizy.com/22971032620.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/guided_imagery_benefits.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_f4fc3b1ff37945939a67c1552f7f3790.pdf?index=trueIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_af6bf253fa5a42dbb5f94dc88426305a.pdf?index=trueIn 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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 5640 bytes
SHA-256: 2529618102762a5aadeee377adc348ac59762bc2b7a67a539371fa6fe42e7330
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 21860 bytes
SHA-256: c5480fd9d86e62518715fc065f5dd3ec71927fb85ecf71358f48eecc7f0a4af1