Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e8fc715947de5a…

MALICIOUS

PDF

67.5 KB Created: 2021-01-14 08:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e9abb7302fbef85661c045c48f952516 SHA-1: 8a4cd178c729a66eebed2441d63558a2a6ecb354 SHA-256: 45e8fc715947de5acca3cb3ddaf6aebc3518e84827a0be48c8fe83665010b47a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on services like Weebly and Mozfiles, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to wallpapers, indicating a lure to attract users to these external sites.

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://trafficel.ru/wb?keyword=wallpapers%20for%20iphone%20xr%20cute PDF link annotation
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/pewekemoxawufofuxaza.pdfIn PDF document text
    • https://site-1190334.mozfiles.com/files/1190334/74952655823.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/7649269.pdfIn PDF document text
    • https://site-1168191.mozfiles.com/files/1168191/mad_truck_challenge_shooting_fun_race_apk_mod.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/c40671bd.pdfIn PDF document text
    • https://site-1176450.mozfiles.com/files/1176450/horizon_credit_union_atm_near_me.pdfIn PDF document text
    • https://site-1174047.mozfiles.com/files/1174047/gravity_run_3_cool_math_games.pdfIn PDF document text
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/zimekito-vofopad-vesewu.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/xijuxosisomuna/93110261607.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/arifureta_shokugyou_de_sekai_saikyou_web_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/because_he_lives_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/74616479830.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/camera_360_degree_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 5184 bytes
SHA-256: f6c3e91a80faa3c4292d6478cc3a00e3dfc79dbe6065d51aef598e1ed04b9ffa
font_01_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 10324 bytes
SHA-256: a5234210919ea249def2dc0844fdb468a991a36fd6554c9203458f22ba9c57c3

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