Malicious PDF — malware analysis report

Static analysis result for SHA-256 27197d0c5bbf7115…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 23:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 482795fd1a8ac08910ff58aa232f072d SHA-1: 91b2e4bc78c760e5916879eaaf5602999631e7af SHA-256: 27197d0c5bbf71154ef9d730ab9efe7ffa31575272b8b94634178fefad3209ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though partially corrupted, indicates it is disguised as an 'Indoor air quality assessment report'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=indoor+air+quality+assessment+report+pdf
    • http://jonotijero.medianewsonline.com/how_to_rhythm_guitar.pdf
    • http://delayikapy.xyz/dj_spart_police_horn_downloadn0bhr.pdf
    • https://cdn.sqhk.co/konidadelan/7KpFhfO/chocolate_baking_recipes_nz.pdf
    • https://cdn.sqhk.co/tefupudoma/Egh7Agf/roman_numerals_date_converter.pdf
    • http://legiontry.online/integral_calculus_by_shanti_narayan_free_downloadsuwyq.pdf
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/gatuwuguzejosa-rapatixojubi-fuluninek-poberajopa.pdf
    • http://kuxni.su/the_pursuit_of_god_aw_tozer_kindlecfdpo.pdf
    • https://cdn.sqhk.co/bisuligiga/jajcxYi/dumivofiporutiloduzit.pdf
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/a459e81.pdf
    • https://cdn.sqhk.co/sojuzafu/j4n3ugi/volebatuxom.pdf
    • http://javaxirivibewi.mygamesonline.org/14393366650.pdf
    • https://gibuzilo.weebly.com/uploads/1/3/4/6/134602166/9e560a36a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e596647e-af07-4463-a3c3-3a209369066a/gifepakawigin.pdf
    • https://uploads.strikinglycdn.com/files/37cb41d2-2d19-4a42-a627-b1ab901f7bc4/tesasewumekebixekamejada.pdf
    • https://uploads.strikinglycdn.com/files/d8d72974-15aa-447d-84b9-6093a2428a9e/was_there_a_remake_of_strangers_on_a_train.pdf
    • https://uploads.strikinglycdn.com/files/1e6e971f-7934-4bea-b32b-69d92bf99d70/lotobo.pdf
    • https://uploads.strikinglycdn.com/files/52211a52-a7e5-40da-9091-6d8ab4cbfe00/what_does_the_christmas_stocking_symbolize.pdf
    • https://uploads.strikinglycdn.com/files/db9a7565-9fab-4643-ada4-1d1b9ea962ae/saxefusofalanuvawin.pdf
    • https://uploads.strikinglycdn.com/files/cabd00af-1573-4d9f-ba58-c0386dfc7c43/puripufujavetomaxena.pdf
    • https://uploads.strikinglycdn.com/files/0af02891-1ff3-42c2-83e0-59abe8129902/lords_of_chaos_movie_actors.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b5.bin
445f5b234bd74eb8c351f612ccd5ed1f53c4f46c700e7cdbca22cceb0222b01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 5352 bytes
font_01_sfnt_off0000fada.bin
37ed6a67dfbe082b73feab9dd382b5b89c464eb9f493ba460e8e6f9ef5e27175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 11088 bytes

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