Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b804e774ce7abf…

MALICIOUS

PDF

76.8 KB Created: 2021-05-17 15:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a13b6370c8a025763cbc2f4dafebf49f SHA-1: 20d3d39a262096a698a7eef7510aaf81e129d628 SHA-256: c3b804e774ce7abfe9652d01b6453a1bf7277114f90d371b7961cdbada7f8a03
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host malicious links rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=presto+cool+daddy+deep+fryer In PDF document text
    • http://sodowetan.mywebcommunity.org/pojitofuzanigus.pdfIn PDF document text
    • http://fegikiji.iblogger.org/65987298403.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/jurnal_akuntansi_biaya_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/Kggb0ge/ffxiv_arcanist_leveling_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/ehbmNeY/gomavewutifabamaxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/gfijNjh/comedy_central_south_park_season_24_episode_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/8uifhi8/road_trip_beer_pong_2009_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_601ad58cb2231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_6053a74151b0f.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/vaywie7/7044305087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_fccf1e7b1b31404f8b9453f43d028c5a.pdf?index=trueIn PDF document text
    • http://fomobiwudaz.rf.gd/88119600038.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_613cd0efb2ca4c29bdc59913c7c94116.pdf?index=trueIn PDF document text
    • http://tinejamuwaki.epizy.com/26476287992.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_e4a84fc67ae44305b28790b550f7316c.pdf?index=trueIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_0ab682322b494dfbb64474870c94cde9.pdf?index=trueIn PDF document text
    • http://zolibexusago.epizy.com/how_to_become_a_more_creative_photographer.pdfIn PDF document text
    • http://nowavef.epizy.com/25969286063.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_353c0a4acefb40e9b8082bf0ce0d0eae.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_558920f91206401d89f268a301293fc7.pdf?index=trueIn 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_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 5252 bytes
SHA-256: 27f72cb76a64bc068cb9e1085d0899e5ebd9b245ad787c8982290de38b10a194
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10868 bytes
SHA-256: e71fc30ca1c80bb209e69120a1394295b943bfbda716bdcc814ef9952dba800e

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