Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92e51db186367cb…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 04:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de3c0ea30cb0ca0fb2215c2b8a6c5cb8 SHA-1: a59e608e02d41ae016ff8346e50a753b20ef575b SHA-256: c92e51db186367cb8eacbfd34801e98698da098cbf4c5d78965eac994f448341
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm hosted on disposable domains, which is a common tactic for phishing and SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/award?keyword=berlin+conference+pdf PDF link annotation
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/ceb18203b59fb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_5fc94cf7eb428.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/trading_morning_gap_strategies.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/jii7ETf/best_contacts_for_astigmatism_daily.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/wofokolitafire.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/xobobix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fef421de503c.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/tabumesevunev-fasavupowub-duvuzumu-zawiba.pdfIn PDF document text
    • https://cdn.sqhk.co/kavevanix/XQZhchi/happy_birthday_cake_pics_with_name_hina.pdfIn PDF document text
    • https://sitadubudotewor.weebly.com/uploads/1/3/5/3/135335426/7b94fd12d2b74.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/aAjdieZ/vesopuleg.pdfIn PDF document text
    • https://dizivabuzazelu.weebly.com/uploads/1/3/4/0/134017784/finilutogobomazis.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/nifogobeno.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/3803673.pdfIn PDF document text
    • https://jeketivogusu.weebly.com/uploads/1/3/1/3/131398097/9654260.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/pidifisotoli.pdfIn PDF document text
    • https://cdn.sqhk.co/nemanive/vggnhcS/top_10_parkour_games_on_roblox.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/jgifhcC/easy_thai_red_curry_recipe_with_paste.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/0F8gi1G/vaxudibeledizose.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/f6hhTor/gujilos.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/b2afe710f0af.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/mifSozm/25136939923.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/iicohfa/brief_marketing_plan_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 4812 bytes
SHA-256: 787166f6062f83248159e4f52ad198bf2ec008a1b3784dd1607fb434c9b6eaa0
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 10936 bytes
SHA-256: 627a90a51785b307f688af0e921f1054e80f8382189d0330aa49f1f10b06d979