Malicious PDF — malware analysis report

Static analysis result for SHA-256 553b9c9d068f3931…

MALICIOUS

PDF

76.7 KB Created: 2021-05-11 08:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9025252ab9d862d90ce9a0b33d3f90fc SHA-1: bd4dc5bb8128faa2af440de46c22594638bdf841 SHA-256: 553b9c9d068f39310e159b1805998c2b53d6ebe41a26663edd46c112eb2abfbd
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to commercial services, likely intended to drive traffic to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=commercial+walk+in+fridge+repair PDF link annotation
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/jimawibokefijap.pdfIn PDF document text
    • http://mynasert.online/what_does_arthritis_in_your_upper_back_feel_like2vyw3.pdfIn PDF document text
    • http://soldatskaya6.ru/dailymotion_no_ads_apkmkbv8.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/340ac2.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/brucella_species.pdfIn PDF document text
    • http://hookup157.site/rhino_nurbs_3d_modelingzkw13.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/wordpress_admin_password_reset_phpmyadmin.pdfIn PDF document text
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/3855236.pdfIn PDF document text
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/28bb63919.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/computer_science_book_for_class_12_pakistan.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/3271335309.pdfIn PDF document text
    • http://cetapp.xyz/pabifemul7e49x.pdfIn PDF document text
    • http://samettemiz.xyz/18331230031ernbn.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/bible_verses_on_thanksgiving.pdfIn PDF document text
    • https://wivojusifapuju.weebly.com/uploads/1/3/5/3/135327063/7115692.pdfIn PDF document text
    • http://universe1.space/47100006121n5pl0.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/filehippo_printer.pdfIn PDF document text
    • http://bt-management.website/pac_man_world_rally_ps4pd115.pdfIn PDF document text
    • http://azules.ru/8309245357g82as.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_a2855ff116514d0db6c20d5a16d3b601.pdf?index=trueIn PDF document text
    • http://fadudenomo.onlinewebshop.net/26895804789.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_9b2acaa678224773a5fb57ac493f6209.pdf?index=trueIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/36777739176.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/how_to_update_kali_linux_2020.1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 5360 bytes
SHA-256: 18616b936f26a3a6b216b557554f051e7ddbf4323b7751789f4733c208bd34b1
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 11108 bytes
SHA-256: e3fc85a647f719f8b70d2cbe071ca104884609a3329addc1b9977d9cf8d9ce6a

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