Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f62e90d10428f5…

MALICIOUS

PDF

77.0 KB Created: 2021-04-08 05:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39a329fbfb70f163917698027cb5bd29 SHA-1: 9bf4d399d736e8bc86899ddcb4831c11eeb1d46f SHA-256: 99f62e90d10428f587a9872228eaab07c8e0ac693a2d8683ab568a8339b198d5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+change+toner+on+brother+mfc-l8850cdw PDF link annotation
    • https://cdn.sqhk.co/dokukavifig/czjihh9/alienware_mouse_aw558_review.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/5073795.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/zuvenaloxusab-xafisiwowizinef.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/hdjajIK/my_android_is_very_slow.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/mafuleratolunezuv.pdfIn PDF document text
    • https://cdn.sqhk.co/nunamarajop/hclhdjc/purepupab.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/bomadosibi.pdfIn PDF document text
    • https://cdn.sqhk.co/wixikinotu/bVighjs/photo_video_maker_app_with_song_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/hdidiaN/13334787198.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/tcifarg/pupuluxogulumobesijid.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/757e3c76-f74f-4726-a0fb-789ab568c1a2/julius_caesar_died_at_what_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3f3960-3b4b-433e-b97a-9fa19c5dd537/python_list_to_string_with_commas_and_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/webibugogomazuziliva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3ccbd0-965e-46ac-abdf-caaeab88ff94/sopedunabuwar.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/deped_club_grade_6_teacher_s_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d01394f-debd-4bd2-81fb-b3c82346ac4d/marvel_what_if_air_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22102bd-8f37-46fb-af70-c7275f38a783/5610708796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225f5e41-d381-44ab-ac0a-c65121ba6c05/13788242277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0b3e8d-3881-41dd-ab8d-58fbed6cf779/dozedupewodesinix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9ff709-8647-40c2-90f0-d0ccc06999cd/how_to_read_tom_sawyer.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 5940 bytes
SHA-256: d79fb43b247d47dcad17c4b2928a8b015772d35e2b2fd7531c98fcd705029364
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 11200 bytes
SHA-256: ae1030dbae26bfaeea03ea2c3589c4587495cc1955498451b16ca8fb72432164

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