Malicious PDF — malware analysis report

Static analysis result for SHA-256 da83839d0ff538cb…

MALICIOUS

PDF

83.5 KB Created: 2021-04-17 13:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 904ef5e191b4d4def75d466cb5c0067b SHA-1: 48ec749d792d72b14c9e28d32ffdcb3d5bd9781f SHA-256: da83839d0ff538cb36e20ae7da39de113ed33b5f1c5009f777c3398e8ac44886
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, and the malformed stream length heuristic points to exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://lozipotod.ru/strik?utm_term=honeywell+pro+6000+wireless+manual PDF link annotation
    • http://avtoshkola-region26.ru/powerpoint_templates_sample_powerpoint_presentation_for_job_interview_pptm2e6w.pdfIn PDF document text
    • http://whitecheat.xyz/tamasha_movie_video_song_mp4kq8eu.pdfIn PDF document text
    • http://kifikawi.66ghz.com/94999583928.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/dreaming_black_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/4crjjk7/rugby_world_cup_2015_xbox_one_review.pdfIn PDF document text
    • https://pivisagut.weebly.com/uploads/1/3/2/8/132815367/8076954.pdfIn PDF document text
    • http://varistop.site/jaxetusivep98coi.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/piwojunig.pdfIn PDF document text
    • http://jipuvojenibomig.22web.org/man_in_the_mirror_lyrics.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/budget_2020_study_iq.pdfIn PDF document text
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/2334bfca0a43126.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/haLjjTx/usher_songs_2019_download.pdfIn PDF document text
    • http://jodefugivu.22web.org/dead_sea_scrolls_archive.pdfIn PDF document text
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/1274568.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/if1Q8jb/codes_in_battle_royale_simulator_roblox_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/47227559728.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/bitten_book.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/basel_iii_counterparty_credit_risk.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/40581830676.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_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 5416 bytes
SHA-256: fe7044a7a7a55f5cf66e685dee35eaf34837e757befe821f8413cf4dd5a93aa9
font_01_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 12384 bytes
SHA-256: 7a56bf33a7e759e3667794ccce3a392aa057230ebfc8acdb40dea9d1dae50e57

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