Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ada2bfea346a51…

MALICIOUS

PDF

71.7 KB Created: 2021-04-16 08:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3007f0aa0c25ac3b865dd3e1627ec3b3 SHA-1: 32c54e4b1fe6adcce19342db29133443253d4388 SHA-256: 77ada2bfea346a51d99661c04c39e3866a3c3d9ddeaf1fe297add5121c3d70a7
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://xezojetit.ru/strik?utm_term=samsung+q7f+refresh+rate PDF link annotation
    • https://cdn.sqhk.co/lagusive/cjiwBjc/meme_soundboard_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_600a81219cb8e.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/aD4hiif/space_wolf_dreadnought_bits.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/fhhhjhi/pass_the_bar_exam_with_flying_colors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_60202c18ba740.pdfIn PDF document text
    • https://cdn.sqhk.co/lamikolo/iyWHNhe/let_s_create_wi_rapids.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_606c4082ed59b.pdfIn PDF document text
    • https://medefidonirefej.weebly.com/uploads/1/3/5/3/135324812/kowamolijegaf.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/dazokubuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_60673d230cb05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fe38f61330ab.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/UZlhjWO/gacha_life_2_release_date_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_601103a5c5270.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/7a67580835bb7.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/h6EUmkV/best_funny_videos_page_on_instagram.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/72c5a6ec1.pdfIn PDF document text
    • https://vofodiwe.weebly.com/uploads/1/3/5/3/135350815/tetabexuzukofe_bejidaxe_weneludisa.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/c6nhfRU/79822208139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_602d755d03f3b.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/rujabepifar/how_can_i_use_my_dvd_player_without_a_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/rival_electric_ice_cream_maker_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/bad_blood_book_movie.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5456 bytes
SHA-256: 9ecaa9dd890f58933166c89b8eb0e87557baab89e74bed4ee523a2bacdd41054
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10412 bytes
SHA-256: c5d4947c406eefec0e59dfbe2944edc6ba73c024018796a8d39f3bb112fdd3b7

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