Malicious PDF — malware analysis report

Static analysis result for SHA-256 7373034744ff083d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 09:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c4458ce4ea077f7b31ea3d140727e064 SHA-1: bce51550c442824671f23785414c331fa74ca7a4 SHA-256: 7373034744ff083d077d9aff9eb8c53896e2c9dae04685efa54f4c642bb92a95
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=abteilung+502+mastering+oils+pdf PDF link annotation
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/wipokojifuw-gugevulabu.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/buffalo_soldier_lyrics.pdfIn PDF document text
    • https://pojalurerisufi.weebly.com/uploads/1/3/4/1/134109142/960e63bbcfad.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/surataw.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/7339254.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/binopunu.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/466201d.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/7083618.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/xuxiwivapigosigux.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/47b181914155.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/little_house_in_the_big_woods_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/zjiVWiZ/police_traffic_racer_apk_indir.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/air_o_swiss_7135_filter_replacement.pdfIn PDF document text
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/getetaduga-rotedawi-pitenigasu.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/ibgiq0k/pet_bubble_backpack_instructions.pdfIn PDF document text
    • https://wavadubo.weebly.com/uploads/1/3/0/7/130775728/jojawudajazox-xedetibopirube-banusa-gobigugujawa.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/cynodon_nlemfuensis.pdfIn PDF document text
    • https://zabuxowinuj.weebly.com/uploads/1/3/4/8/134874463/kanudupaketif.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/hfVMjhu/walking_dead_cast_season_5_episode_16.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/IhbUggi/luxor_deluxe_room.pdfIn PDF document text
    • https://darojavanobize.weebly.com/uploads/1/3/4/8/134889586/4128726.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/9701358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/216905e0-28f4-45d0-ae83-904b50cbc085/stihl_weedeater_fuel_tank.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/fozove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b902f9b-f101-4104-93e3-ef2ad6a1d031/how_to_tell_if_your_dog_is_in_a_deep_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552db748-cee5-4069-9056-42ba8c50041d/how_to_program_a_fios_voice_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e634f5-bc67-4391-8f99-62852e769787/25105542045.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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 5888 bytes
SHA-256: 5998a50148404e80234039405805286060cd784eaa6930c0dc2eead50a9cb49d
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 12160 bytes
SHA-256: 4fd5c3e060efb45889e79cf3a85962ac4657a2b8a8a71d709a71a04b897a5d40