Malicious PDF — malware analysis report

Static analysis result for SHA-256 421a4ebbb6f269c9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 11:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 68cf8bc575e447efbefd57a31b953788 SHA-1: 5f01d5c3dc53b5710158863e9c21ba67d36c00c8 SHA-256: 421a4ebbb6f269c9035424ae8ffd23ad659a65a3d666ca268315961fd52f7e2f
186 Risk Score

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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely intended to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=eht+nature+reserve+turkey+trot PDF link annotation
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/1aee0d8.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/j5BAWig/tron_light_suit_for_sale.pdfIn PDF document text
    • http://keripudatoxene.iblogger.org/bollywood_dance_gif_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fivobebetax/hctjcja/busy_busy_song_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/cWhfjbm/super_unblocked_games_vex_3.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/jhkSugh/31605320505.pdfIn PDF document text
    • https://cdn.sqhk.co/mefomixut/gde42hf/bang_bang_song_uff_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/gdgh4hQ/catch_candy_bar.pdfIn PDF document text
    • https://jadomuvifaxa.weebly.com/uploads/1/3/5/9/135960305/satuxipobonuvus.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/SgjhbJG/43418615265.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/Pgi9yke/atif_aslam_old_songs_mashup_unplugged_mp3_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_ea36bb2006e247c9b4fec0aed1010cfa.pdf?index=trueIn PDF document text
    • http://xiriranur.epizy.com/near_double_facts_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d625cc-dd2e-4b67-9a95-4b5d17309c3e/keto_diet_meal_plan_for_a_week.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_885afa9eff1f46e286f24e51d32f1efe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9daa59c-c472-4e72-b948-579b60900fe4/how_to_turn_on_hp_probook_6550b.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/38861552902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd5ba3a-3b1e-495b-806f-5ea064a0d5cb/zinadeku.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_a8159b4337e042c7b3ea6872e4399ed7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b9fb22-11b8-4f7c-b268-a200e235595b/southeast_asian_model_aphg.pdfIn PDF document text
    • http://gapexer.rf.gd/34484522342.pdfIn PDF document text
    • http://fedasumenusum.rf.gd/betofagalofujo.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_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 4924 bytes
SHA-256: 2ffbad50eddba0c311afadda648b50abce4defd847abe3559a1e5506dbbcb2ff
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11812 bytes
SHA-256: da222e2b9a82298dca648234541845973b75c645256556c97bed5272532ee1f2