Malicious PDF — malware analysis report

Static analysis result for SHA-256 af73aac07f055221…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 14:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa61500b2d3e68cb91c01ec4e202e712 SHA-1: 0b7e4becb055e75c0f315c5d4d884938d7b15a41 SHA-256: af73aac07f0552210a5334b002a358f4cb58dc1969433112353ed002ae29af5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'inwebjor.ru' with a 'pokemon+go+update+android' UTM term, suggests a phishing or malware distribution lure. The PDF structure itself contains many links, characteristic of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=pokemon+go+update+android PDF link annotation
    • http://totoumi.jp/upload/file/pofiso.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ralivinarosenipeno.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/58428010036.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jolusatuwudanilig.pdfIn PDF document text
    • http://aven.su/userfiles/file/kodapukogefariweputavi.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/penojovulexu.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/45724313337.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/varixuleka.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/73774781278.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/5982844796.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631515822.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/masatemojaxukofil.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/49525661446.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wotikidenugasuraze.pdfIn PDF document text
    • http://panova-art.com/files/file/65052074337.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/sanajolopufujubuwov.pdfIn PDF document text
    • http://labotinnghia.com/img/files/mosijesuze.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/kawifibukemewopazifaxoru.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/14421245665.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/jekozupopopiloruviza.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/51925292656.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/peben.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 18380 bytes
SHA-256: 1a2e29668be37385aa7419d0c24b860ed33945395fa68555fe561e9315dc0a8c
font_01_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAD 10716 bytes
SHA-256: e987210b4423f70fbef1794c270c7e3b2db6d00826db36545a71d7f5285b9d9d

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