Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c73d2159c7f0a5…

MALICIOUS

PDF

83.1 KB Created: 2021-04-08 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69670a533500ab54837120c2598dddf9 SHA-1: 81486cffdbc02094bc1c91b6ffdcaf04750b6d8c SHA-256: 22c73d2159c7f0a5ba66b7d0cf19868303bb872ac142ed566c36c8b64aa487d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://xajibur.ru/strik?utm_term=where+can+i+take+my+cdl+written+test+in+oklahoma PDF link annotation
    • http://dawexefif.getenjoyment.net/emperor_jones_records.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_603541622fda3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_60684795f11d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fc75a21017ac.pdfIn PDF document text
    • http://pakamid.22web.org/19995774251.pdfIn PDF document text
    • http://buvemalo.66ghz.com/kundu_medicine.pdfIn PDF document text
    • http://bewerab.22web.org/kujomufukipuretutatiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6019280a8b1dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorijefugixor.atwebpages.com/bad_blood_secrets_and_lies_in_silicon_valley.pdfIn PDF document text
    • http://mukonedes.epizy.com/vasekuselupu.pdfIn PDF document text
    • http://deriwabip.epizy.com/numbers_in_french_language_guide.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_7c70e7a7d58f479dba2c36aca90514b2.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_4dbd74e6b54a4f9587ee2daf5b195619.pdf?index=trueIn PDF document text
    • http://kunubuxeduw.epizy.com/angularjs_tutorial_w3schools.pdfIn PDF document text
    • http://zukeligo.rf.gd/wavelet_transform_python_image.pdfIn PDF document text
    • http://gufawakibabu.rf.gd/vce_to_converter_online_tool.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_eaf6aca7472e488aa7abc0e3ee5a5422.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_7bff889527f94608815425004a5cf3dd.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_95056ccb1e44481e8b0ca53a03198dee.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_8d8c87ec9cd140d7a46e85e183dfd4fd.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_4f4d86e7522242d1bfef612e61e813bb.pdf?index=trueIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/what_is_the_setting_of_the_story_the_bet.pdfIn PDF document text
    • http://jabukejezari.epizy.com/mogikij.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_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 5448 bytes
SHA-256: 977627faf13a5d96d96385477b25357b937b8230e0e671b7f21363b57e1631aa
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 11780 bytes
SHA-256: ea8c12f37de6840a03c15f31f299cc898f0f33cb437e2377425c46e3ca0553fb