Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc2a891c39f392b…

MALICIOUS

PDF

83.6 KB Created: 2021-04-29 21:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 279a46042500e66554b01686c3bed412 SHA-1: 340cf5f2c787d44411c9910b4cde3e917de13a5b SHA-256: adc2a891c39f392b0ca9d0c2827f299a3883a7fea0263e6a449dc9e60e3301d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=short+film+script+writing+format+pdf PDF link annotation
    • http://freud.icu/kaplan_asvab_prepnoz2a.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/23509192225ougfj.pdfIn PDF document text
    • http://instapriz.website/863991522694t1z8.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/hNPiegg/dino_t-_rex_simulator_3d_mod_apk.pdfIn PDF document text
    • http://bestunew.xyz/96210531721py7xw.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/dizovebiliwugezupekeje.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/breast_cancer_project.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/BHhcxrl/42204708063.pdfIn PDF document text
    • http://gumoximowukowot.iblogger.org/donewoxopimigusume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/wopiwilifadovikav.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/59284080031.pdfIn PDF document text
    • http://zuvovebedevavu.rf.gd/boss_dr_880_drum_machine_youtube.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/barron_s_ielts_superpack_free_download.pdfIn PDF document text
    • http://jowadonexasida.epizy.com/tabela_brasileiro_2020_serie_a_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c695c90-0fee-46ea-80f7-bd852350f161/kipojejofufezexozixozetov.pdfIn PDF document text
    • http://nufeluzuxaluw.epizy.com/46052208000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde6bf50-6c3f-446b-9224-03a7ad1d4bca/64425079292.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_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 5764 bytes
SHA-256: 7f7879433dfcb4c1bfbef298fb21779e75129a19aa821d11d4005d9b77f5d357
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 11256 bytes
SHA-256: 7538fe570bef7456b196c124d7711c01755e83f622f4996033293d17f37e8801

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