Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb08d50b93b3d7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 06:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38f9ee21e8102ec7b1ec619a85cbd261 SHA-1: ec655e321d073a2bfb6ae914d4af0b1d85cc87a3 SHA-256: 7fdb08d50b93b3d7dc034a4319800c92f3504440956b497f4d4c2ad96ddb79e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=android+option+menu+icon+not+showing PDF link annotation
    • http://mycoapaisyl.com/webimages/files/fikexosezisepir.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zinelomonifoxi.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/70012664683.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/60344076840.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/2175948687.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210907_495969BABA0EA06F.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/71444074893.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109031912277843.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/65305896103.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/renozarukuv.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141504b208e1---5525566442.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/bokasulo.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/vavuberivazenugoziv.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/foxex.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/pebefelikivilemupab.pdfIn PDF document text
    • https://sainaudit.mn/File/nafokin.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sujurevajozotitodododosel.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/94455971265.pdfIn PDF document text
    • http://simonide.org/userfiles/file/95614699608.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/24769081396.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/70823342602.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_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 10920 bytes
SHA-256: 393c251e5b49472554bd3b034f29bd3c3acbf454a8a9293065643651d11b9df0
font_01_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 17088 bytes
SHA-256: 58df9513f95530c282e40ece98c449af894ba65e07876663162ee18172200663
font_02_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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