Malicious PDF — malware analysis report

Static analysis result for SHA-256 43665000c1ebfcb9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 14:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c32bd3cb381ddd41167a53ad96b1ca27 SHA-1: 3589c12e6bb2c6d021bc931f4dcde185cdffe036 SHA-256: 43665000c1ebfcb984e77377a648f35aaa16ae12896c1f05da048d300ea4c36d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The primary lure appears to be related to iPhone app download issues, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=iphone+apps+are+not+downloading PDF link annotation
    • http://peak-experience-japan.com/images/blog/file/80973523610.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83cea3d90---xaferim.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/tokajodefegopivifupomogo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kegokowamurizixubenobet.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/xopupepiluteli.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/99366278433.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavixikabogajijorivetesu.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/kasixukitameb.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/ravew.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/rimogekakagiwirarajewadom.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/33074024467.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/diwekidifabivobep.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tiwawe.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/89483642538.pdfIn PDF document text
    • http://scsychem.com/upload/files/zilukewugev.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/fukezibikex.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nemubonitarifadimiwobew.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/verinijop.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/xugupinazabiritog.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/67657768369.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sijabeterug.pdfIn PDF document text
    • http://elma1.ru/!upload/files/95079204723.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 18012 bytes
SHA-256: 48d9b17221e5638f2ccf4ace0cab55f54e3383e0eab2fe252681f9bb0125aa50
font_01_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 10708 bytes
SHA-256: f9f1b83ebef409b96dc05f160464b74347f5c9f3f0b88c2e6cdfe157809ae313

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