Malicious PDF — malware analysis report

Static analysis result for SHA-256 411f5574b315ff03…

MALICIOUS

PDF

86.6 KB Created: 2021-03-02 03:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b636272f5cecbf07c96a96ea23cd6fd SHA-1: 2b3c0e0fa87910ae046f5f7d4cfae2f2b6977b3d SHA-256: 411f5574b315ff03486d2c2c59f438ad586d0669d7664b03935606c1961a3a42
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=go+math+grade+5+practice+book+pdf+free PDF link annotation
    • http://ruwemipuwev.mypressonline.com/86007835178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_601514ed51d27.pdfIn PDF document text
    • https://cdn.sqhk.co/varaxupumami/SRhwmll/undersea_fiber_optic_cable_cross_section.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/ihp3jdR/download_car_simulator_2_og_mod_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ffb4ad6e7e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_600a5c3b69771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/6759981138.pdfIn PDF document text
    • http://baxojusapu.epizy.com/xuvetotexukovifebofid.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/what_year_is_the_kindle_fire_hd_3rd_generation.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/28326843841.pdfIn PDF document text
    • http://zubeleboju.epizy.com/pavax.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/55658578958.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/pomedigiwejijudi.pdfIn PDF document text
    • http://mafojupovovod.rf.gd/gagifekolupof.pdfIn PDF document text
    • http://pidosowot.epizy.com/aapt2._exe_has_stopped_working_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/battery_tender_plus_charger_and_maintainer_12v_1.25.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
    • 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_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 5720 bytes
SHA-256: e92d804865f2e00e95b3545b056d75ae8be06dd858378a8d44dcf0cf08b54f27
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 10748 bytes
SHA-256: bc5d0cd0fd5dc4f1c1f3e2e40f0b5c7d808203648aaa713f200c60e63ed75847
font_02_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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