Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cacea5e99fa3c5…

MALICIOUS

PDF

72.7 KB Created: 2021-03-06 16:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e6f8c8bcb7c65c1ec67b9cbe98f1ba18 SHA-1: dc002e4a5c9109fb16dae8a2cdede048408b953e SHA-256: 73cacea5e99fa3c5715865d98cf85da06ac16ab32d7701af5f953af2e548df1f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though obfuscated, references a 'Craftsman 11 piece air compressor accessory kit', serving as a lure to encourage users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=craftsman+11+piece+air+compressor+accessory+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff0e5df24eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_6023feacc97b7.pdfIn PDF document text
    • http://zakisazasidakiz.iblogger.org/konica_bizhub_c224e_default_password.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_6035e6ff7d6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_600d9b68c0e47.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/8225558.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/7806707135.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/wuwidel_sokotan_vujes_mojotufolizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_60158786f0f5b.pdfIn PDF document text
    • http://jigefur.iblogger.org/20008363152.pdfIn PDF document text
    • https://nirilixurem.weebly.com/uploads/1/3/4/4/134474770/pivig.pdfIn PDF document text
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/292be02b8d.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/how_to_make_anointing_oil_biblically.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/persona_4_golden_true_ending_guide_spoiler_free.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/bojigaxab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugamofizuxeg.epizy.com/kavit.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/placing_commas_in_numbers_worksheet.pdfIn PDF document text
    • http://zelubosomud.rf.gd/bell_bottom_song_kannadamasti.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/sony_android_tv_o2tv.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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 5252 bytes
SHA-256: 511da964d85b0330c8307d094e0fe7d75439424f9bf63a93f317ed3f73bc3619
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10372 bytes
SHA-256: f4647ab614bf471676c0b786f14320ed23b50defc15c1c560aea090d180c4ed7

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