Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c8a66adb08fadc…

MALICIOUS

PDF

108.6 KB Created: 2021-04-06 17:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2a1101f4334deddd56478670951ee69f SHA-1: 5a8787d31557fedb8f7854f94b3836604a92b45c SHA-256: 21c8a66adb08fadc330eb39f02206b6793dcc305afa9bf291c6abef925cee7a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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://vilenefex.ru/aws?utm_term=polaroid+sx-70+repair+shop PDF link annotation
    • https://pedudevapo.weebly.com/uploads/1/3/4/7/134719514/jisoneli_solumebop_gonasop_jipizu.pdfIn PDF document text
    • http://apparently-home.com/how_to_clean_a_cordless_waterpik_water_flosserly3ep.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/pdf_to_word_converter_free_nitro_cloud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_60328779e1746.pdfIn PDF document text
    • http://indital.fun/sisutudip2jevd.pdfIn PDF document text
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/b100e99c3584a7.pdfIn PDF document text
    • http://health-top.ru/android_phone_under_20000_in_nepalu830d.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/the_first_48_missing_persons_season_1_episode_2.pdfIn PDF document text
    • http://bottlechainworld.com/the_love_dare_free_download885ry.pdfIn PDF document text
    • http://5coupon.info/865680799259w24r.pdfIn PDF document text
    • http://reduslimitalia.website/stanley_burroughs_master_cleanse_bookvqxp2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_601078a3e587d.pdfIn PDF document text
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/9272001.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/vebalo_sijiwebo_luzurirod.pdfIn PDF document text
    • http://samoe-samaya.ru/maytag_centennial_dryer_switchtkoel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5ffb05ecb6d0e.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/learn_international_phonetic_alphabet.pdfIn PDF document text
    • https://gitodaxip.weebly.com/uploads/1/3/5/9/135960033/numusavalal-vidobenulit-kuzureran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_5fda98e5c306f.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/viwoxuz/aws_jupyter_notebook_install_package.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/moburevikidikuda.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/traffic_racer_apk_hile_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/spektrum_dx7se_review.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/how_to_become_a_dentist_in_india.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_off00016be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE6 5368 bytes
SHA-256: 82ed840740f5519e45e9e3607de0d58c39572cb08458acd42663ef19c4debd6e
font_01_sfnt_off00017e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E34 11160 bytes
SHA-256: 8feab14d3305a7652f3fe74e20b4cfda07e3cb7e9578bb77226fb8464e0971d9

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