Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51e3fc0df41a775…

MALICIOUS

PDF

74.1 KB Created: 2021-03-07 00:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9624821d0f866c3a1e42cac5db58ae50 SHA-1: 105e0cf2a6f57a2de5f639f1c48263b02b8e4df5 SHA-256: e51e3fc0df41a7754b2d7a67c25aaaeaa319b9d58ea34fc419094b1bcf391ce2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'human genetics worksheet answers', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=human+genetics+worksheet+answers In PDF document text
    • http://zokiwedilar.mypressonline.com/rolumet.pdfIn PDF document text
    • http://heliusdesign.ru/964224765079owos.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/raymond_carver_cathedral_citation.pdfIn PDF document text
    • http://blognews.top/academic_performance_researchhv7qu.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/86990324722.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/ymx5Lja/wasosojevemofizelo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/csjbggz/masukoxus.pdfIn PDF document text
    • http://ukranews.site/compass_learning_us_history_answersufcfj.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/38805847903.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/SGibgix/dipinodovujeri.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/Hgihibz/tofekogiwizufomezazab.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/7579862377.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/laler.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/46Hic6O/pinballz_kingdom_prices.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/bipimonusikepef.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/f9f9bd8a-c458-4c3c-8628-437b6acfee61/gavigariwemez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd06d19-664e-456e-9a06-9e01767ffc89/43083393008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3b7b65-4c84-4790-b656-0bca8e4584c1/10228214117.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/25949289300.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/rpg_mv_save_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96146fbb-f5b2-49f4-88b0-c9f83405471e/povajisijaj.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/74305474117.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bubble_shooter_5_apkpure.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_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 5296 bytes
SHA-256: 4a549be4dcffd7bb437ff227c8988c0f57dc1d19742bbe782767583c289f66eb
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10408 bytes
SHA-256: 1cc3b563b928c5eb9968371b4f9d49be45e26aae2fa740773c1d46f04dadf422

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