Malicious PDF — malware analysis report

Static analysis result for SHA-256 538cf37bc07a3dca…

MALICIOUS

PDF

80.9 KB Created: 2021-05-16 20:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d17d6adb4f4e2f0833f47bbc7e0cddc SHA-1: d02ef70d5485e26b43d3077446d963da19cdd8da SHA-256: 538cf37bc07a3dca747aca32570fe60ea016abcebd73ac6ca5dd4d29a0888857
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, identified as a PDF link farm. Several of these links point to potentially malicious domains, including one that appears to be a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=guerra+de+guerrilla+en+espa%25C3%25B1a
    • http://btsworld.org/varaxinigirepivadit2kzn.pdf
    • http://tvoyoproc.fun/xifoketumezelalimuvwfff.pdf
    • http://nepatokada.mypressonline.com/8453241343.pdf
    • https://wimowago.weebly.com/uploads/1/3/0/7/130775393/a6c730.pdf
    • http://sodalabs.club/69477718442az5cx.pdf
    • http://mitutepoka.medianewsonline.com/gas_laws_equation_sheet_answers.pdf
    • http://folejaf.mypressonline.com/absalom_absalom_faulkner_download.pdf
    • https://telutifezidawu.weebly.com/uploads/1/3/4/6/134624569/baremamadano_badebupunogami_jezuvogarebin_revefuwawep.pdf
    • http://help-igcopyright.xyz/kopoluwisivssifd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeruxaxer/titobupexi.pdf
    • https://s3.amazonaws.com/fixararololu/loss_of_pet_card_template.pdf
    • https://s3.amazonaws.com/leteraxewe/zarafap.pdf
    • https://s3.amazonaws.com/rawesaragegugar/the_selection_coming_to_netflix_casting_call.pdf
    • https://s3.amazonaws.com/tifuwuw/acapella_app_picplaypost_apk.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/under_the_dome_season_3_episode_13_in_hindi_download.pdf
    • https://s3.amazonaws.com/panalipolifod/letter_to_explain_late_submission_of_report.pdf
    • https://s3.amazonaws.com/waxapoz/challenge_2_hd_video_songs_free.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/dupevowubigew.pdf
    • https://s3.amazonaws.com/rowubunak/2_chainz_it_s_a_vibe_mp4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf0.bin
739df7a5939c3254f0ec05976512989f7d00b5a897020ac17ccbe450f97445be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 5372 bytes
font_01_sfnt_off00011002.bin
19a4d3f7f071e7d1ebaa0841b09858ef11e963552bbb04bcbb85745bb0b12b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 11152 bytes

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