Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce5fb8b4e550f8f…

MALICIOUS

PDF

81.1 KB Created: 2021-02-25 22:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f13808555c177e3ddb5acf81343bdd87 SHA-1: 54b851ba44a07d4a2bd7c392666d9e22493ef29e SHA-256: 9ce5fb8b4e550f8f6f7fde602b4370218d1b59cb5992541847a0a9c90d00717f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a worksheet, aiming to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=membrane+function+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411709/normal_5fcc72abbb1d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_60009f682688c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5ff9cc1e1960c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fd64dc85a7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_602b39b6899bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_6035665eb67df.pdfIn PDF document text
    • http://wirelosine.22web.org/68349725793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/26349631040.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/youtube_2020_poker_tournaments.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/totosepar.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/bazeludivifafukiz.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/52617952636.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/54410996721.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/the_commander_amanda_burton_episode_guide.pdfIn PDF document text
    • http://loxosufodu.epizy.com/31752983302.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/what_is_externalities_in_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/smile_direct_club_insurance_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/ielts_fever_general_reading_test_17_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/kimilamepegonikosu.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_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 5392 bytes
SHA-256: 0b1eb7a3eb94054401ca3aca1313eb8ab0f6f368e5f56e6b3f08172fb54a192e
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 10224 bytes
SHA-256: 25df02a89a5eae5a15305dae8e21447ad7b3ca65f5fb63f33e24f34e11982037

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