Malicious PDF — malware analysis report

Static analysis result for SHA-256 b478b8672bb0a775…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 02:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4ecd030769543ef2f9c62febb083128 SHA-1: 5a36207267adb1fe43c58993795970ad99bcabeb SHA-256: b478b8672bb0a775a5f08c6d4b530ca5b303bbd2f9a13558ac3bd45036eacc3f
134 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=analog+and+digital+electronics+textbook+pdf PDF link annotation
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/778013.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/9382604.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/kupimigonitopepot.pdfIn PDF document text
    • http://antonioita.fun/crochet_bucket_hat_for_beginnersezfmx.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/5835743.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/bobisetejunaz-mowomelur.pdfIn PDF document text
    • http://viewcreditscore.info/peligumogdnj4.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/2xgiPge/one_gotta_go_candy.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/how_to_turn_off_flash_on_polaroid_sun_600.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/basic_electronics_vtu.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/fifijjg/warplanes_ww1_sky_aces_apkpure.pdfIn PDF document text
    • http://9gusevshop.space/1530399634671m7b.pdfIn PDF document text
    • http://kyukty68.xyz/free_music_s_for_phones_full_songs10da6.pdfIn PDF document text
    • http://bio-ita.fun/86978257354v3ksz.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/formula_of_mathematics.pdfIn PDF document text
    • http://b4shop.icu/33277886926xchta.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/probability_crash_course.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/widetunipet/hotstar_premium_cookies_txt.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/sebiwaduruwivapos.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/is_ksp_on_xbox_one.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5372 bytes
SHA-256: f952bb2d0b2db8a1e1de75b423565669b8f1d2cace455d9343901790fc5580f5
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 10956 bytes
SHA-256: a8c3bc5ab6b87f66fa61c3516f3de048f18fca94e913dd9458ec72a4497a1c40
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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