Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9caf3a7d6f58fbf…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 00:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 047d0629f668d87715e35d16c10d0b4c SHA-1: ebf5d6fd40d7ef505afb69e87836b9b8a2182538 SHA-256: b9caf3a7d6f58fbf1c9f3b552aa0d4a90e0466c9f10a7b2311d73612375db5a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'garglob.ru' with a 'messenger last version apk' UTM term, suggests a phishing or malware distribution attempt. The document likely serves as a lure to trick users into downloading a malicious application disguised as a messenger update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=messenger+last+version+apk PDF link annotation
    • http://koovappadyscb.com/ckfinder/userfiles/files/24616661735.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/bubefarizi.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/pupavik.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/48664170340.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/xewusimilozalebusedijinew.pdfIn PDF document text
    • http://staropolski.net/Upload/file/tetulapasu.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/pilenosaxenemokatelokixaz.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/xanagapawunaxidurufosud.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/67440765217.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///teduzuwavadasazadefalegaw.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/2040291521.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210912081147633.pdfIn PDF document text
    • http://sunway.me/uploads/file/101210418723.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/batepadalijeg.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/25360141855.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/87185527967.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/94487574662.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/sifedokowe.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/31772213586.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/48157777455.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/papodurokerav.pdfIn PDF document text
    • http://web5gstore.com/Files/files/rawagelawuz.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/vebopamubapejawej.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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 10580 bytes
SHA-256: 8460eb48c7f01b5583a87cab35f6874ad0f6e6911aeb8f9cba4a52c536956be6
font_01_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16384 bytes
SHA-256: 0a6d6fc663c9d81b5f1825fde5eadf463fa2a62c00c49a5a4f5162aaa03260ec
font_02_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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