Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8528dbb3af1bc4c…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 08:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4715f35c005fa7ea35a53ef06c6f3a30 SHA-1: 21c6f56e65e3cb5110b2984de12fa31d9badceac SHA-256: a8528dbb3af1bc4c98d24225a69e33bab0352341cd1e5315e946e898a7dc8160
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 0.9998

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://baarspo.ru/123?utm_term=necchi+sewing+machine+manual+pdf PDF link annotation
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/ruwopimo_nowuge_badawix.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/gegguhe/meaning_of_neighbour_in_english_language.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/cjg5sdR/rise_of_the_roman_empire_brainpop_quizlet.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/kazozunifosodap_lupebotoduxu.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/5bYTkjf/cut_the_grass_low_to_see_the_snakes.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/jdijxaT/keweg.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/lukamigeroxixuvod.pdfIn PDF document text
    • https://cdn.sqhk.co/kesokirow/fibIjbJ/animals_in_winter_worksheets_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_60116dbc130ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600bed05d419e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_6023b47fab788.pdfIn PDF document text
    • https://cdn.sqhk.co/muvenetu/dhjgeie/blackpink_top_10_songs_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5fc96cb7047ee.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/IjcjueN/9614744508.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/9gedHid/bose_colorlink_2_wont_turn_on.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusigod.epizy.com/the_tibetan_book_of_the_dead_buddhism.pdfIn PDF document text
    • http://tokaverojov.epizy.com/9th_tamil_guide_free_2018.pdfIn PDF document text
    • http://tunawibiga.rf.gd/coreldraw_latest_version_2018_crack_free.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_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 5532 bytes
SHA-256: b8666c60d24ee8bfdf0f86d56f5ca71a6fc9522da91cd0f330fe0d9621a2e12c
font_01_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 12208 bytes
SHA-256: 3f4ce2c50723a7cbbebd6f0e5d73a6f99ddff4f652dde281cc0774b6da8868c9

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