Malicious PDF — malware analysis report

Static analysis result for SHA-256 5444dea9c8f30a0e…

MALICIOUS

PDF

77.0 KB Created: 2021-04-09 05:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d727044a846b5ae7cb124266ae5c95ca SHA-1: 5d097b7a930e7280f02c7938fca68d09d4295bda SHA-256: 5444dea9c8f30a0ed0bd03459dabed07d05fc3f9ad3760abb40f95a58661bef4
156 Risk Score

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 0.9997

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://nipisod.ru/strik?utm_term=cuisinart+convection+toaster+oven+1800-watt PDF link annotation
    • https://cdn.sqhk.co/kazipexe/jeNheNm/13855881678.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/zQRwjhx/ocoee_river_whitewater_rafting_deaths.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/4HHgfn4/meridian_157_prologue_drawbridge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nakevoja/management_of_information_security_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/dogobavanupibaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/bubble_saga_3_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/bitarexozasuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/butafipifixenapipopot.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_b0fdee0fc41f4a368db079758492ae9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/boxuregonijikizumineme.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_2076db732a1c4fc29a8b1512c4a46dd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remuv/bowmasters_mod_apk_2._14._2.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_ad4e13307f9a41ab84f554257f693923.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/xopesaxijukesorozawusok.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_59b164fa9654499192910e796a90d2cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/par_q_test_english.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/kemebuzekeraxegogabowen.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_1d604db765844c908b5749bed7bf0f94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/calligraphy_for_beginners_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/31803086289.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 5236 bytes
SHA-256: 8154f2c8ccb94740dffa00305ff562cb6fa147d712919e76c76ad3d2f0bddda4
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 11000 bytes
SHA-256: db56cbee2c65fc67d7e18e1af7d3f8d539bb8c4015b3db2f8c002aabeb709bf4
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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