Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5528a0909af8ab…

MALICIOUS

PDF

73.0 KB Created: 2021-06-05 19:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 21c64ae90edc2fcc9786daf06da2449a SHA-1: 1d832a2808e83f527032c44aa37fe42a198db3fc SHA-256: aa5528a0909af8abf1c025b92873755f52e11eedfe000501b81cf3b2abe4cf8d
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 0.9997

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://xezojetit.ru/123?utm_term=candy+crush+saga++in+jio+phone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fe297dcee295.pdfIn PDF document text
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/5246613.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/walipoxebe-kagomesima-xofojev-farupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_601673413f186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_6049aa66eee3f.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/b0f1e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481173/normal_60aff189ec407.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/xabowarapuziran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601afc704ca0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_600e4b7685669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekodunu.pbworks.com/f/32031889752.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/william_navidi_statistics_for_engineers_and_scientists.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/37623466129.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/29500610781.pdfIn PDF document text
    • http://betifufato.pbworks.com/f/how_to_write_meeting_invite.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/apega_competency_based_assessment_guide.pdfIn PDF document text
    • http://gutopevif.pbworks.com/w/file/fetch/144576900/nozinetefidizigap.pdfIn PDF document text
    • http://saladolu.pbworks.com/w/file/fetch/144618843/how_to_end_a_lodger_agreement.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/mera_bhola_hai_bhandari_song_download_mp3mad.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144667020/jenazugukiderode.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_off0000ceb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 5384 bytes
SHA-256: 1780d0a2307fb6a62bbb4865202ab4f13ed3c245e096a3000787738fc2868b35
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 4632 bytes
SHA-256: d5369e54a3765dd2777a5d36827385eb1cc5abfe1d1f74053a671363577bf3bb
font_02_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 12488 bytes
SHA-256: ef0366e6543c57e7952169d7a10a74da5b77191eeba32e689c3e83d2cdc07e16

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