Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef33c9c91f661cad…

MALICIOUS

PDF

72.4 KB Created: 2021-03-24 23:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37666275137981a8e1de7bea0609d418 SHA-1: 30a7ed2e33a447377e04908f6459c0fd638c6290 SHA-256: ef33c9c91f661cad8b50e23068c45fe41071324695215c7b64bf27614311b4c8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search queries, further supporting a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://maypoin.ru/strik?utm_term=how+many+calories+in+bob+evans+macaroni+and+cheese
    • http://vakafubetax.iblogger.org/komunixuf.pdf
    • http://fowironomuk.iblogger.org/panukemabujelidux.pdf
    • http://lozosomegav.iblogger.org/craftsman_3x21_belt_sander_parts.pdf
    • https://cdn-cms.f-static.net/uploads/4446642/normal_602b2423ddf20.pdf
    • https://cdn-cms.f-static.net/uploads/4489588/normal_604b7e70b5431.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pixuxurarosu.epizy.com/apk_burma_tv_versi_9._05.pdf
    • https://s3.amazonaws.com/wuxupewu/top_android_games_mod.pdf
    • http://tefuguwo.epizy.com/9965747593.pdf
    • http://dupudenagebokez.rf.gd/how_to_pair_plt_legend.pdf
    • http://rexenejo.epizy.com/dasawodonom.pdf
    • https://uploads.strikinglycdn.com/files/f861236f-aecc-4b55-a537-d39f1a80fee3/what_is_penal_system_definition.pdf
    • http://zopezotudesod.rf.gd/vaxeberekezizis.pdf
    • https://s3.amazonaws.com/mefonevimimix/mojozetepuvex.pdf
    • https://uploads.strikinglycdn.com/files/a485eb82-a707-485e-8fe2-fc18a3b0dea5/mopikudofupemafekun.pdf
    • https://uploads.strikinglycdn.com/files/965e5e56-557f-4419-9fac-31cb10587c83/which_cobra_radar_detector_is_the_best.pdf
    • https://s3.amazonaws.com/wutezigojuxi/lilydale_lake_fishing_report_2018.pdf
    • https://s3.amazonaws.com/mejawiwomak/phone_call_sound_free.pdf
    • https://s3.amazonaws.com/fefurorobumi/airac_1909_fsx.pdf
    • https://uploads.strikinglycdn.com/files/802f2119-b7f5-44ca-bfa8-c86b210d386e/doviwu.pdf
    • http://poxipepeti.epizy.com/foxugumobekobod.pdf
    • https://uploads.strikinglycdn.com/files/434a7221-e471-4f9c-ac84-1fa31b8b1a71/wodaminul.pdf
    • http://nubejapowij.epizy.com/wordscapes_answers_level_9435.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_off0000de3f.bin
9de65518c4a437797d23f9a9874fe05dde34236ba812a7237791f150fc445a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 5536 bytes
font_01_sfnt_off0000f0f4.bin
ed81cbcff314bf5fdfbc7a308eacc3ed6880d6d1de5c16c89d87db7148bda909		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10120 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.