Malicious PDF — malware analysis report

Static analysis result for SHA-256 d643748ebd043e29…

MALICIOUS

PDF

110.2 KB Created: 2021-03-20 01:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 280956e735e61704b38284379a823c3b SHA-1: f17dbe3c2b4f5a5adbe59e3adc0da10dd666045b SHA-256: d643748ebd043e2948964ff6638ccad7ac1ce5ff169b42c58c219d4e5264772c
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and link farm. It contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains, indicating an attempt to lead users to harmful sites. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=exo+vaticana+pdf+portugues In PDF document text
    • http://vuxilenusip.mypressonline.com/applied_behavioral_science.pdfIn PDF document text
    • http://muvajopumo.22web.org/implant_surgical_guide_sleeves.pdfIn PDF document text
    • https://dozefiduvema.weebly.com/uploads/1/3/4/6/134617149/xaxepenelozizororem.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/jnjD7gj/my_movie_home_projector_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fupipevu/Qehbig5/xaboninawazup.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/ipiegea/risotevufarizexajizejisi.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/c39968e39b3be9.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/corporate_finance_institute_career_map.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/0d43c73aaecb.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/g9uVic4/ninja_jump_pick_up_exercise.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/jhhiicI/tap_tap_fish_mod_apk_1._13._1.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/4616182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimawawasero.onlinewebshop.net/lidapikifubabijeki.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/basic_english_grammar_book_for_competitive_exam.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/58880828006.pdfIn PDF document text
    • http://sosozodazu.epizy.com/79681377264.pdfIn PDF document text
    • http://potiwivig.epizy.com/12807394776.pdfIn PDF document text
    • http://fuwasal.rf.gd/chamara_ranawaka_song_album_free.pdfIn PDF document text
    • http://jatujij.rf.gd/jeet_kune_do_lessons_online_free.pdfIn PDF document text
    • http://mezubivedoxida.epizy.com/addition_worksheets_free_printable.pdfIn PDF document text
    • http://vibobip.rf.gd/78110800020.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_reset_asus_router_factory_settings.pdfIn PDF document text
    • http://fewuzefar.rf.gd/tegurodokawata.pdfIn PDF document text
    • http://romezegipoxo.epizy.com/ergo_360_baby_carrier_age.pdfIn PDF document text
    • http://lugirike.epizy.com/ridenerukirosu.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/next_unity_asset_store_sale.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_off00016957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16957 5376 bytes
SHA-256: 0488d18c5e40e1638e1ac34b25ff3fd891d71d667e5dad7a0919bdf767f4e8f4
font_01_sfnt_off00017bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC0 15736 bytes
SHA-256: e1ed057bf68672aec312b2b45560d0aa7fc039f59d89b4897f638c1e13908ac6