Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f58922ed8367964…

MALICIOUS

PDF

83.3 KB Created: 2021-03-20 18:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a81772fa117d2e813bb999079f8a674f SHA-1: 2e995b269e4670c6bc6f623abf6efccd93e6b12a SHA-256: 1f58922ed836796488bb607e3c8cf3ad0d7df60a827f6d273e1bb88d8a35f64d
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This, combined with ML classification and ClamAV detection, strongly indicates a malicious intent. The embedded URL is likely part of a phishing lure or a mechanism to download a second-stage payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=ariston+dishwasher+ls+620+a+manual In PDF document text
    • https://cdn.sqhk.co/forokuxodel/K8Thfgc/91046762257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_6023ff04184fc.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/deathwatch_40k_codex_8th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_60551606b931e.pdfIn PDF document text
    • https://cdn.sqhk.co/fazofasufiwu/jaIFhLW/15801895944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_5fc898ca2d0cd.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/2669690773.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/aNHN1ih/42666477335.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/iz2jhQs/farupezu.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/nemafu/logitech_mk700_mk710_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924aaaf2-d6f0-4591-a788-bf3f0178fd61/14401484732.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/colouring_fractions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf4732c-d708-43b1-8331-7bf7c18fa56e/89363883693.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/best_online_guitar_lessons_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/gakilidadefetapeko.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/duxekamolaxowajo.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/video_helper_firefox_48.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/aye_axemen_orientation.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001141b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1141B 23304 bytes
SHA-256: e18f959ce2ad159e8ab2c7df40c338fba62a51763e18101b4f331e3d1d0ad95c
font_00_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 5572 bytes
SHA-256: d39fcbcbe5a43c414d59e47d768b4ec3018578422028a9145ada0f29221cdcd7
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 11908 bytes
SHA-256: 412f84087367f857e9a8e8c21c608651e4249941513b70adb453494537878fcf

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