Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ff78662ac44c2c…

MALICIOUS

PDF

85.0 KB Created: 2021-05-14 02:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 827a09079f3625c44b27c4213322ebfa SHA-1: 26c946a851d05bb13330966c4c8262ef4852827b SHA-256: c2ff78662ac44c2c1f9a8a52f6fb6920318ab7af2d79c770e2e1780eaec7e20e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to an 'application guide'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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://dafemum.ru/strik?utm_term=wall+sticker+application+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4469126/normal_5ffa360e9eece.pdfIn PDF document text
    • http://fiwadewemizoti.iblogger.org/71906986545.pdfIn PDF document text
    • http://dazopumanufek.iblogger.org/fagajilatozam.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/3029589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369802/normal_5ff77ffb0e257.pdfIn PDF document text
    • https://fixugosotodig.weebly.com/uploads/1/3/7/5/137518485/wuwukoj.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/lenamur.pdfIn PDF document text
    • https://javosupe.weebly.com/uploads/1/3/4/4/134456121/tuzugowazota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_601f780819f10.pdfIn PDF document text
    • http://nextauto02.ru/dibujos_para_pintar_para_nios_frozen49bwa.pdfIn PDF document text
    • http://rarojuso.22web.org/dolowikikobilugixebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ff4c69e29947.pdfIn PDF document text
    • http://arevakar-travel.com/tik_tok_music_tone_mp3_downloadkziwg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fcbe31854b67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xibabenamogen.epizy.com/diwukoluzotejevosifosunim.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/soxekefakoxudunabuxawaluk.pdfIn PDF document text
    • http://kimamewaseziwal.epizy.com/45161290621.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/4994997915.pdfIn PDF document text
    • http://gudanomakorake.epizy.com/49799861790.pdfIn PDF document text
    • http://zoxuleresuxenez.rf.gd/kazuxomizuvixivo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/6957436732.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_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 5200 bytes
SHA-256: 884be861f2dd5f74d452401aeb826024fb809974623937823ade8f981fcefa7b
font_01_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 11264 bytes
SHA-256: b970c8cdd90214e97a0c0f0840b3b1464208d1ab47de19e5e66c06c4fb03d866
font_02_sfnt_off0001387f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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