Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ce5ebfa1734352…

MALICIOUS

PDF

73.9 KB Created: 2021-03-15 08:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e0c73e57b71f691e8d7681753d6effe4 SHA-1: 22e506c5283a329c8667c465c483e59267b5aa01 SHA-256: a3ce5ebfa1734352ef2c8849b4915d8089496808a97eeae467199fa582f7dccb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a lure, likely intended to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wix?keyword=alla+prima+schmid+pdf PDF link annotation
    • http://lyudi23.ru/463323274670r7m7.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/3666146.pdfIn PDF document text
    • http://tersq.fun/david_kibbe_metamorphosis69lkn.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/e6bfe633fac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5fecb5b24d690.pdfIn PDF document text
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/8866140.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/tovupunigaxunipamoduwmblfk.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/BaijEhd/seniac_castle_tycoon.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/7Q6QFjf/wechat_app_download_for_windows_phone.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/gabimowubenusaseza.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/Fgig3Zq/teachers_college_library_databases.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/07cbeabe499.pdfIn PDF document text
    • http://re-capital.ru/8330716489555235.pdfIn PDF document text
    • http://rusakova.space/283580671xqka0.pdfIn PDF document text
    • http://iglivesupportteam.com/beowulf_translation_tolkienx1znm.pdfIn PDF document text
    • https://cdn.sqhk.co/xafileme/1iijeid/power_audio_pro_music_player_free_apk.pdfIn PDF document text
    • http://honbiz.pro/world_war_z_xbox_one_multiplayer_gameplay949id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fe18f607f478.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/c5878e34-ffea-4585-8f22-9bae7731fd0d/fumumowimek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664014e2-9099-4110-a7bd-d280846fc7cb/xizakilewasonilog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffbd013c-0a5f-47ee-abf4-406f12eea073/voltage_limiter_circuit_using_zener_diode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0822450-a16f-48bf-bf5b-eaf4dd5778a3/dell_inspiron_6400_ram_upgrade.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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 5384 bytes
SHA-256: e70ce87c8adbb9ebf453fd30673696e22d479ebec76f6cd68b042d424761787e
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 11376 bytes
SHA-256: af27c052e769afcf7d61412da287035ffa283cfbf642818c1b506ec495327a75

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