Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638bc54f80f542b…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 12:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d442ec1cd38c83d03ed369df874205ac SHA-1: 5682e7a4da10b87679224351d271825e1b335750 SHA-256: 2638bc54f80f542b0bff906521b2e8ffcc561ca3b061e768a408d1883075df6d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic indicates it functions as a link farm. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wix?keyword=mi+lucha+pdf+google+drive PDF link annotation
    • http://mumolazesinidix.getenjoyment.net/damip.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/zapojuvuriwo.pdfIn PDF document text
    • http://kevareso.iblogger.org/vufigosamilo.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/iowa_state_university_campus_map.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/sandman_neil_gaiman_netflix.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/57336647037.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/wivazigenobijokowuvibire.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/anthem_blue_cross_medicaid_appeal_form.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/3146449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_cd398b38c9574407a6442c7de02bfb65.pdf?index=trueIn PDF document text
    • http://powazov.rf.gd/89438960740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff8aee5-c429-4209-91af-7946fd0d4bfa/18302727192.pdfIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_1c35948179ca4da8b9ec376183a593ba.pdf?index=trueIn PDF document text
    • http://demezokesude.rf.gd/neboredurafukeniwuku.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_ed1eb4591ef3491fb436eb9313c5d5c8.pdf?index=trueIn PDF document text
    • http://bajipenu.epizy.com/66434492900.pdfIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_e1151e2497214118839cec79792f713d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af9034c-a496-4186-82c3-adaa83181d21/fevuziromifomoviv.pdfIn PDF document text
    • http://rosurujonuzaxa.epizy.com/ncert_english_grammar_book_class_6_download.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_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 5304 bytes
SHA-256: 42b0243b8fd6a775598760775728cccc956d53523378edc1ed1c12839d362ff9
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 11104 bytes
SHA-256: 281f691bec8e926dd5c703b37c8affb775f8594f6e7ff41e64684cf7abf2c04e

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