Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa77e2b441fa409…

MALICIOUS

PDF

76.7 KB Created: 2021-01-09 19:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1ef1d5aa0a13ef8201c9dfa79c182a55 SHA-1: b9846742ddf9351ddca1de0bb6873fd6c14f7f2f SHA-256: 4aa77e2b441fa4097df287a4d983c704c4e3e9320965f1ed5da7ec48fa200c94
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malware or phish for information. The presence of external URIs and a link farm on disposable hosting strongly indicates a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafftec.ru/123?utm_term=kill+the+farm+boy+audiobook PDF link annotation
    • https://site-1166749.mozfiles.com/files/1166749/equalizer_audio_pc_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/pgfdjeZ/dynamons_world_2_by_kizi_mod_apk.pdfIn PDF document text
    • https://site-1179585.mozfiles.com/files/1179585/96150859815.pdfIn PDF document text
    • https://site-1171754.mozfiles.com/files/1171754/good_fishing_spots_near_me.pdfIn PDF document text
    • https://site-1173371.mozfiles.com/files/1173371/forest_survival_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/dhaFhbg/47940648310.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/jbhbo2p/guess_movie_title_from_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/jVgfAje/57063390811.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/hagfUPc/47629148346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5f9807b6b6fd5.pdfIn PDF document text
    • https://site-1174047.mozfiles.com/files/1174047/lucky_bunny_evolution_game.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/jQhb5Jb/44969133692.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/cigRUhb/66057786219.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/kefodek/animate_cc_2019_free.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/resume_templates_word_free_2019.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_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 5244 bytes
SHA-256: e20042172f5dd1ad44c5f248dedda289f0b1427100f553df2b16c0b01cd6a397
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 10548 bytes
SHA-256: 607198f5a1931450ed8a19120ec1fda690653d44458ef20d83eb185c0942bef4

Open this report in the interactive analyzer, or submit your own file for analysis.