Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6d8df2d7c21dd7…

MALICIOUS

PDF

99.1 KB Created: 2021-03-15 01:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6f6f3002e59d1fd603c31ea9b076da91 SHA-1: fe6eace5eddbb45a6d92503f7b563bd0e0258e55 SHA-256: 5a6d8df2d7c21dd72b7fbb1eb5966b43874a3c1b321d4600280db78e3af20256
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one notable URL pointing to zajinet.ru. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=chokher+bali+novel+pdf+in+bengali PDF link annotation
    • https://cdn.sqhk.co/lanuniwa/3iijQnn/gisuzusumadosorife.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/21gihh4/9923478559.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/ditifixevofaf-zijesog.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/fajaxafezexava.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/rudexip.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/yehf5Ki/70335425102.pdfIn PDF document text
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/9344742.pdfIn PDF document text
    • http://susasami.22web.org/nuevo_testamento_interlineal_griego_espaol.pdfIn PDF document text
    • http://bakelenodizaro.iblogger.org/ada_guidelines_2018_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/90491706569.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/ocbc_cheque_request_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/nufiduziwogup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d656793b-0b87-49d0-933a-cdede0facce2/pofafopibuzazirorutamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82645d5-7d83-445d-90df-6a8121b53d16/mufivakevaseno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6929b9-fd59-4183-a68a-35a6b6973a11/how_to_get_apple_books_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/how_do_i_start_my_atwood_hydro_flame_furnace.pdfIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_7f03f6259ac24f68bf67591e598e6492.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/gamelupuzipesazanerel.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_3b5bcd90cddc46329be075ee06a0cc1b.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_790d4e289a5e4002b81cbd456053ffdb.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 5296 bytes
SHA-256: 8060552a3f2635570cdd16ea6b7f98ceee1dd0cefca69a30fe87d5e49cd7e7ff
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 21824 bytes
SHA-256: 695a86a3da5dccb28919b0dd9ce35f41d54affa64c9d3e4c8aa499230d92f980
font_02_sfnt_off00015693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15693 11960 bytes
SHA-256: c885b9b410dcf8871b99ea2c45e90d32ca8f2c73ba56bac94e62a07c2d61ebb1

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