Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a33921d94ee9a9…

MALICIOUS

PDF

98.1 KB Created: 2021-02-20 17:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4bad737364fb2b84de41e16a085ad861 SHA-1: 1863240e639c47d6b1836dedc3ba062dfcf213b7 SHA-256: a9a33921d94ee9a914a6c40a9d4c0ddcd8ec2fdb1bf7f91782daf93e1b4cbc70
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=frigidaire+affinity+top+load+washer+reset+button PDF link annotation
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/kijij_koresoja.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/5573674.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/2509427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5fd840bb623de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_60248ce6f24c4.pdfIn PDF document text
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/nomasalogum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fe88e9ae073e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_5fd7c63ed687f.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/vidadaviwal/bunty_aur_babli_all_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/jaani_dushman_movie_song_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/angus_beef_chart.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/rosovisulimisojunewezivu.pdfIn PDF document text
    • http://segelomo.epizy.com/gutizulevije.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/easy_commodores_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/super_sport_live_tv_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/99116632347.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/tanip.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 2860 bytes
SHA-256: 334cfb5caf2de2a6392c3fd848e3ca70c2296f1c88ee8275f738c665b50502e0
font_01_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 5592 bytes
SHA-256: bee41f982c65356988ea07ddb102b955e9feeba6b2ee3b13da1233768046fc80
font_02_sfnt_off00013c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C02 12292 bytes
SHA-256: d1bc9d155a1b311fc5ce3be3ea0ce29d28aa9e8bdae17920e036fa7a6ada0e75
font_03_sfnt_off00016535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16535 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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