Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a3b1fd74525315…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 23:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 401595ce3045a4c885a33dacb5777b50 SHA-1: 9a4f863c7608d63b8b55d6922e3af8f72a1aba6f SHA-256: f9a3b1fd74525315e45bd26fd3951b107ccade0728ddfedb3b0d48532b8c7570
186 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 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=medicaid+in+michigan+eligibility PDF link annotation
    • https://cdn.sqhk.co/zegofurop/g3ifThd/jatafowepavuviruziv.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/5xjcicB/wordscapes_level_8580.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/X7jijax/road_trippin_podcast_video.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/inkscape_tutorial_vectorizar.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/iajgyid/download_airtycoon_4_mod_apk.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/laporan_amdal.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/1WTLg8X/best_buy_nyc_5th_ave.pdfIn PDF document text
    • http://fixmarker.fun/136419689628ieox.pdfIn PDF document text
    • http://viziziziv.mywebcommunity.org/49325446006.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/13577015967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fdff590803d8.pdfIn PDF document text
    • https://cdn.sqhk.co/makekajet/if1HIic/android_messages_next_update.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_to_pair_ue_boom_2_speakers_together.pdfIn PDF document text
    • https://cdn.sqhk.co/zokonerozo/YT8idhj/xawawurevufikam.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/9jn2jqV/uefa_champions_league_winners_table_history.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/most_played_music_in_south_africa2j02i.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/j8mifhe/telecharger_tubemate_apk_2._2._9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fda3bbebffa2.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/ctamihy/wordbrain_2_school_level_1-_5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_6a329b66bc7841cd85ea83f5223b52ca.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_c8a321ba450b4ec0b2d9a1fe26901b3c.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_054b33472dda434eb2123fc2c5db22e3.pdf?index=trueIn 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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5324 bytes
SHA-256: 952f9ee78eb5f2cdb0792f58ea90343e2a49f3c138ce4f65b52a0f2e58b09b27
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 10884 bytes
SHA-256: 5e24076256eeb5a943a3f985a9352767e77bf9d29e815f2f60b7c71b9bd85f3f

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