Malicious PDF — malware analysis report

Static analysis result for SHA-256 149c13ce8bb36702…

MALICIOUS

PDF

88.1 KB Created: 2021-03-22 01:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e506efda09057cb6f4abf775e75f06b3 SHA-1: ede33b021c5b152fa93608cf54ed117932931ccf SHA-256: 149c13ce8bb36702911ecefa93f63cc5055e47d2b4308c4db3a7544c6a3922cd
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though corrupted, suggests a lure related to a "Saxon math placement test 7th grade". The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=saxon+math+placement+test+7th+grade PDF link annotation
    • https://cdn.sqhk.co/vivugiwu/hhjaJsE/33174895022.pdfIn PDF document text
    • http://o-karte-kopilka.com/83219856276tvdko.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/lgdKh5M/run_run_super_v_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_60418c67d0284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_602868f5656e2.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/nisafijitowafiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/8z8ijhf/lumejejilipi.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/95355947205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463830/normal_60027740898a5.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/hdTTzaF/wild_panther_sim_3d_apk_android_oyun_club.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fca930bcb377.pdfIn PDF document text
    • http://belkwigs.com/historia_de_la_administracion_en_enfermeria1u3mt.pdfIn PDF document text
    • https://cdn.sqhk.co/mizopopowaze/aEgjges/traffic_court_lake_charles_louisiana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fc7db04e1704.pdfIn PDF document text
    • http://thelandofbadideas.com/dadapataguwiwoj5p0g.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/3414404955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_5fe80276a5aa4.pdfIn PDF document text
    • http://oneitshop.info/preposition_quiz_year_3z4fsl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_60120da0d6649.pdfIn PDF document text
    • http://trenketo.buzz/23854238072z89vv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdf535b-1614-4210-8832-088da5a48163/momofonot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ca4ab4-333a-4553-b6c6-0b6cf4dcc8ff/what_does_la_la_land_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68b902e-fbac-4c84-833e-2076213ec696/girujati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b8d445-1030-41a1-8180-eca800ff2b45/gefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a3298a-2841-439c-885b-7cc0b5c1eb69/the_girl_with_the_dragon_tattoo_2011_film_series.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_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 5740 bytes
SHA-256: 158789cbafa48e6f890701dd2f60dec97d4300913645e19dd150c80c4fce20d2
font_01_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 11492 bytes
SHA-256: f6d1ebf92971f26b2ead1f33e2a14da18f866d796d129b3b3f3648b99f6213f5