Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52ef30ee21a9bdd…

MALICIOUS

PDF

74.4 KB Created: 2021-04-17 05:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b933ea5eac1e886ba15a97d454720ec SHA-1: d17341ccca7a8a3180249208ae49f2b7978c21e4 SHA-256: a52ef30ee21a9bdd4273119e990235c279049c6f01bfef2c0de709d8ccd7afa6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://dafemum.ru/strik?utm_term=how+to+open+a+liftmaster+garage+remote PDF link annotation
    • http://xosubowavenu.mypressonline.com/78708707287.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/kosunedovosututa.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/john_deere_x304_bagger_attachment.pdfIn PDF document text
    • https://pemejugaxopuled.weebly.com/uploads/1/3/4/7/134749032/zibev.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/13031073556.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/eddf967a-0270-477a-bd78-1734553b1346/78959111075.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/conjuntivite_bacteriana_tratamento_antibiotico.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/tintin_2011_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/adler_theory.pdfIn PDF document text
    • https://198ac300-f2de-41a8-aaa9-2df0d2bfefbb.filesusr.com/ugd/232b71_3bed80f81bab4d7cac9b5e8efceb2db9.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_fcdfc73931084a24bab6a1bbbf99fcb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/jizozevakavubimivaju.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/bosch_dishwasher_silence_plus_44_dba_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/21276094455.pdfIn PDF document text
    • http://negumigimewote.onlinewebshop.net/audible_bossypants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b673c5ba-7020-4730-8fe0-e8bd5ce6e53f/sisumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6495d7b5-a43a-4892-a645-ff2915ce33c1/can_you_program_a_garage_door_opener_to_open_a_gate.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/dojexumixulenoselat.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_67c38138239f40e48b09d93f87bcabb8.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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5272 bytes
SHA-256: a34415cda561003ba1ad211a085527c190752cc36a4ed2bb08d756666a9bfbaf
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10916 bytes
SHA-256: bf6a57616a918fee51309e73a1ca07580e33090e12f107f1cead1bfe626adff9

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