Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8932fd64e8bc8a…

MALICIOUS

PDF

79.5 KB Created: 2021-10-05 16:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6539e3bb45fe3d2e243891167e555ab2 SHA-1: 397a1c61a43d11b6211eba3c9fe44ff482954b95 SHA-256: 4d8932fd64e8bc8aa2b340d5da3f69f896719fa88b222a0c70d0550c66479625
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' further support the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=photoshop+make+new+layer+from+selection PDF link annotation
    • http://szentdorottyapatika.hu/files/70243060150.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/pajuvaxolera.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/nopimugama.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158a390b3647---76552864390.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/fowaxemotanako.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/40160156962.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/89260819913.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/jejoburigalimatos.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/48533737884.pdfIn PDF document text
    • http://fivelscope.net/fckimages/79173056739.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/roxazutebakagu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/kapazofi.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/buwukevuzabejinew.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/86111308999.pdfIn PDF document text
    • http://rayanchem.com/d/files/8421479018.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/52046692052.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/ferolopisaberuzoked.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/70641726562.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zanitozoxozamaxa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/60755178642.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/78475274932.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/86507680995.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/pivironanizote.pdfIn PDF document text
    • https://ohligschlaeger-bIn macro / runtime command snippet
    • 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_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 11040 bytes
SHA-256: bf085284483f0d5f110afe06d64d80ca5f300bc77db8ddac55c6e0abd7ed7698
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 20460 bytes
SHA-256: 0ab521df7945f3bc19785285c0737a75b35c67789e51585e62d0cb4c0a228ab9

Open this report in the interactive analyzer, or submit your own file for analysis.