Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afad835521eacf8…

MALICIOUS

PDF

81.7 KB Created: 2021-04-29 15:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b4b9a158d0feb22daabf942fdca3641a SHA-1: b16b1bc2e60152562cc6bc615d985c0ec64030b7 SHA-256: 8afad835521eacf81a39c72aae0a50dda2d82992fc0d9590bcaadd2c6d2bf2c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=casio+mudman+green PDF link annotation
    • http://biotringel.shop/sezozuzadezufanavitvds2p.pdfIn PDF document text
    • http://classkaod.ru/skewerz_annoying_orange_game5mj53.pdfIn PDF document text
    • http://smartcreditscore.info/73634870356uoahm.pdfIn PDF document text
    • http://amsidgi.xyz/mjr_digital_cinemas_corporate_officeqinkr.pdfIn PDF document text
    • http://podarokinsta.site/vunikozadunus9q5w8.pdfIn PDF document text
    • http://azakalaza5.xyz/fejebojenowifodios5du.pdfIn PDF document text
    • http://smallita.space/722215841723mvw.pdfIn PDF document text
    • http://meetsol.xyz/what_is_the_half_blood_prince_movie_about96hq0.pdfIn PDF document text
    • http://islemleriniz.org/building_self_esteem_worksheetssoigq.pdfIn PDF document text
    • http://pristav.pro/kofegex510z7.pdfIn PDF document text
    • http://navalny.design/suleded55t4k.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/4716b649-d6b8-476d-a615-8986ba656d5d/dell_active_pen_replace_battery.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_ef52fcc42738417ea192dc4c38f71139.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec592db-5d5e-4e45-9462-cd13e8054757/voiced_and_unvoiced_sounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16682250-afb8-4399-8ced-8f6dbf417445/wunomofuziji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c38776-b41f-41ef-b743-5bdda6fe92d5/51526736508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22c74dc-9328-48d4-912c-f3b5ec4469d2/bijuxozoluzokin.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_526f5562286544dbbcd0776afeae7b1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9ef2ca-f733-44fb-83c8-e9871565cb8f/77862631076.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_97bdf508a3794c528ae15a4fec65bcdf.pdf?index=trueIn 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_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 5016 bytes
SHA-256: dd2dd3311c492f399fa80729f7b8fee37cf84c4c0cb762b92564e0f580e8d162
font_01_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 11176 bytes
SHA-256: b41060350af4a3c80062718c7996d63f83e32ce14d86462b55956816e3722e95

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