Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e548ca32886909…

MALICIOUS

PDF

77.3 KB Created: 2021-06-05 10:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 721df77c753584b27a7dd3ceab4426f7 SHA-1: af8f9e8de1f2dd4f74ceb69dbd8f78e0d369f4c9 SHA-256: b4e548ca32886909da3f14bdde416a294fc5ab7d265e513b9ed73f8c7ab1fd8f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'pixomot.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to reference a 'cuckoo rice cooker', likely a lure to entice users to click the malicious link.

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
  • 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://pixomot.ru/pbw?utm_term=how+to+use+cuckoo+rice+cooker+cr-0655f PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474998/normal_601b57974a3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_604caa5694db5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426686/normal_60b1944ce3447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5ff40f8e8d708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fc6532aaa3d5.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/7988783.pdfIn PDF document text
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/4202082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_603eff74a7157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_6036c2d3f119d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456369/normal_6006cf6545429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386337/normal_5ff992dd52ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_6043fbee320fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxapoxowo.pbworks.com/w/file/fetch/144645201/plants_vs_zombies_2_music_jurassic_marsh.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/minecraft_ldrdn_eye_dnme_modu_indir_1.12.2.pdfIn PDF document text
    • http://puxivir.pbworks.com/w/file/fetch/144651420/is_zanki_zero_good.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/15208556287.pdfIn PDF document text
    • http://tevimunon.pbworks.com/w/file/fetch/144638451/how_to_fix_epson_wf_3640_error_code_0x97.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/2881136164.pdfIn PDF document text
    • http://nonesupul.pbworks.com/w/file/fetch/144628851/relolusovokebawota.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/f/where_to_put_cheat_db_on_ppsspp_android.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5204 bytes
SHA-256: 6602f92adbbababd64bb9356ff572419be1c80f196db222b2dbed52ae83ba365
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 11564 bytes
SHA-256: 3bf9f2cb3922d53a93eb773bbdf404ac9badca132838f932abab99028c36b624

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