Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ec266a9d4dfcc0…

MALICIOUS

PDF

76.1 KB Created: 2021-04-11 21:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2769af149ca64d5ee711f4b5eb045a8a SHA-1: b1bed505b8b51e0d19c8d05f0e139c5a22cc709b SHA-256: e1ec266a9d4dfcc07d453a3b84594dc9adbbb0d290351fe4bf1690ef8b95265e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to other sites. The primary lure appears to be a 'free download' for jazz guitar chords, which is likely a pretext to encourage clicks on these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=jazz+guitar+chords+book+free+download PDF link annotation
    • http://vizionsmc.net/saeco_odea_giro_plus_descalingkcahw.pdfIn PDF document text
    • http://pirawamajakemiv.22web.org/nccn_guidelines_breast_cancer_radiation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_601bcbbbaab94.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/hVKdrw7/pear_launcher_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/gd6kWjh/video_banane_wala_tik_tok_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/1geqiiy/angry_birds_2_film_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/MDBhhgi/shot_ball_drinking_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/eBNjiLa/zumitexusibubogavafun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5fc9ed6d9569a.pdfIn PDF document text
    • http://lozhobelir.space/zombie_crime_shooting_game_download_for_pc6okkm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449181/normal_5fc7d6b5dc43a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_13f8e5454a974b1d911183971a212f72.pdf?index=trueIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_e08f68f19fb84778a0ad83d56a2de00a.pdf?index=trueIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_134317e4b54b4ebc819f372a300b7189.pdf?index=trueIn PDF document text
    • http://ludakijawiku.rf.gd/the_5th_wave_book_3.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/44394381860.pdfIn PDF document text
    • http://gezuvemun.rf.gd/balu_telugu_songs_com.pdfIn PDF document text
    • http://fosixijikalapi.epizy.com/sreemath_bhagavath_geetha_malayalam.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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 5616 bytes
SHA-256: 77131287926cde6a2813d0562c7f26691099ca9fa7fbb54bca215784ade6ba69
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10916 bytes
SHA-256: 6da46fe5432bc567152e96de748afaa6add20f377ce510f699f252013d9a413c

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