Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cdb9f719c1ba60…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 01:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd319ff088264a082e1f00667fea09a9 SHA-1: 5b5bcea843580449726f06e1464eeeebc8c16c38 SHA-256: 88cdb9f719c1ba6022f87748231dd5a714dcb8dbb9ea6e973c21f44664ba4523
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9954

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/award?keyword=emerging+trends+in+educational+technology+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fe8b579e3f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_5fd857956c2b7.pdfIn PDF document text
    • http://nuvekediporere.22web.org/fujitsu_fi-7160_driver_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ff71ac46b2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_6049062b0a507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5fcc3eb6d6a15.pdfIn PDF document text
    • http://wavigubozivud.22web.org/possessive_noun_worksheets_for_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/ibifGij/91117099079.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/Tgi5azW/89436379139.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/5Sicov7/aviemore_loop_kingsley.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
    • https://s3.amazonaws.com/popisiburewixuj/english_alphabet_sounds.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/what_country_has_the_highest_prison_population.pdfIn PDF document text
    • http://wavujeg.epizy.com/c_template_class_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/chanel_logo_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/20871777186.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_ddfde01b0af3499182f2de1ce7ee50e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/behringer_mixer_2442fx_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/vowaxizusarev.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/50767312531.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_2977ff05e42c4c34b82203161e1dae75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/dumikutonuvofozud.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_131e2182617642b8913a67385cc73eb1.pdf?index=trueIn PDF document text
    • http://tisudaxutuz.epizy.com/microsoft_access_crackeado.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/vemobelavu.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_8e90d3b455b942de9782af6c07b75269.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_78befb192f5f4e018ad98cb48de36763.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5508 bytes
SHA-256: a959197ed13e821c1d4e0076f2103d8334895b69456e39f642d6322608f9b2a1
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 10716 bytes
SHA-256: 1198baff3b713b0411e6faba0270e3aec95bb15319d3dd331c907af50e1603dc
font_02_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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