Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb385c433154d5b1…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 14:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d402c0d27d77898b7ee634333c6f8eeb SHA-1: dc930e0ee94c18a82eccf1500d30dd4a9b09eb57 SHA-256: eb385c433154d5b1c37529dff4106a317f260c82e6d14f02bc1adfe6096ef322
194 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external links, many of which point to disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to host malicious content on numerous low-reputation domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload via the embedded JavaScript and linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn----otbbfbbknchz.xn--p1ai/sadm_files/gitabibosobujaxu.pdf In PDF document text
    • http://polimak.pl/userfiles/file/53275305784.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95297070652.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210920051855.pdfIn PDF document text
    • http://net-marketing.hu/images/files/lovorodejevowosa.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/gukobured.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/72733140556.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/poxovusizenavuw.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/99373222727.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/72546392849.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/29820620877.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210923085409.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/zizar.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/54782021614.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/dodilenipududikulafekef.pdfIn PDF document text
    • http://retrofotr.cz/files/file/59815409399.pdfIn PDF document text
    • https://brakos.it/file/7861700622.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/xunavanovitotoza.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/rotajuni.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/60413536492.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/povulotav.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ffdd5873ba0b6b609d56b4562a7dcbcb/zogebezadi.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/ginudenufiluwibuparuger.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/lanatafuloxaleg.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/pubogafudetubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clash+of+heroes+iosPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 14620 bytes
SHA-256: 9fd55fdf8aa9867bcd22134a83b9b716c5414eedaf434c635440064a2dfc8f71
font_01_sfnt_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 10140 bytes
SHA-256: d21ef0352ff4133d506501fbf4b381fce4f06ad9eb3a19fa33a7640a6d5a33bd

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