Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d26ee8f3751d1b…

MALICIOUS

PDF

68.5 KB Created: 2021-04-05 13:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0bd88813433c9f37a0d09e477c82c11c SHA-1: 15d0e424c278773fa5696050bd61a15f3fec599b SHA-256: c5d26ee8f3751d1b703ba3f100df177b30ea007602728c821ab93db44db4019d
134 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 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 0.9996

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=bubble+worksheets+for+preschool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464865/normal_603d08753e27c.pdfIn PDF document text
    • http://aycotoro6.xyz/857820556u6fj1.pdfIn PDF document text
    • http://shtangye.xyz/8th_grade_grammar_textbookoaztu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fda55325384f.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/zizeditagaso_sumajabajepano_beloju.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/1ac7a58875.pdfIn PDF document text
    • http://cheeronthemove.store/troy_bilt_bronco_parts_13aj609g766lttsl.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/zojiwenixobubuvakek.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/7fb79e52e75be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_6053bfe82a78e.pdfIn PDF document text
    • http://prizinsta24.online/28301405718hlzre.pdfIn PDF document text
    • http://bestita.space/renetedabl18c8.pdfIn PDF document text
    • https://gunutusubev.weebly.com/uploads/1/3/1/4/131437775/18c48120f56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5ff4bd3359520.pdfIn PDF document text
    • https://murovufusefafa.weebly.com/uploads/1/3/5/3/135331463/sosamazu-danuwepuzukub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/a_burglar_s_guide_to_the_city_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/al_quran_word_by_word_translation.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/winter_survival_kit_for_car_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/self_destructive_behavior_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/abwab_us_sarf_free.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/b._ed_syllabus_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/sig_p229_legion_holster_review.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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 5240 bytes
SHA-256: 68a54da55c91f2001f794ea9d8c2f155d94f659b9495529a59f6b418d6699652
font_01_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 10236 bytes
SHA-256: 699b5e1d46cc87cf1306ba6df455c802640a9972972162b9f39402106aca1cda

Open this report in the interactive analyzer, or submit your own file for analysis.