Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b7a84d247d74a5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 01:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 04f828b7e917b4bdb92181b58818ae2c SHA-1: 3e35b71425bce93fd9b24320d1b6149225a2a50b SHA-256: f8b7a84d247d74a53b3d55d2193faeb810be506743d8859f1703c4ed2a1b12f6
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous external PDF links, many hosted on disposable domains, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to other potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://olgapolyakova.com/files/files/logufulizekurovipamavur.pdf In PDF document text
    • http://huntland.hu/upload/file/puwiw.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/vupufedexinexat.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210904051721_MTE1NzU2NDcyMTk=.pdfIn PDF document text
    • https://successalpha.team/upload/files/nazirixanaki.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/65c009449a63ed0fd019a37539052450/vodaduvi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tivula.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/29256452116.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/xezetatit.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_64D46B634601B5F2.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/31028881987.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/65472039131.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/h7or57fksvprafou2lgm4e83j3/linumovivut.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ponizofekugemokagalewa.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210913071010.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/jolenilave.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gawuwanafivukinaxanekepu.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109170825581569.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/99932244408.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/87033985407.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/63184919545.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/josaduwepexikil.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/54754517153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=simcity+hack+download+apkPDF link annotation
    • 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_off0000b86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86A 16052 bytes
SHA-256: e2f581916681b9183d057e23dacfa44868d41c3b5178e92bf7cf9c5cfc2c32ce
font_01_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 10744 bytes
SHA-256: 6f6663bc61bb46a3dc97e685ddd2fadfaf7901b0c21c23488e98d2aeed3ebcb5