Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeccdda7d442e2b1…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 20:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7837510dfed54a6896f2d9f2371eadd SHA-1: c48918a9332cb7af7c2da10d191218f0f2e7a14c SHA-256: aeccdda7d442e2b11aa10c6682928e86ca9fe3129f877a56681fe29fdde069e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on distinct domains. While no scripts were directly extracted, the nature of the link farm suggests a potential for distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pzhjintai.com/upload/files/23912411774.pdf In PDF document text
    • https://keongracun.org/contents/files/fewagijuwenukaranigupax.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/libipanaxuxepenar.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/tozotunakugawidum.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/33587241390.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/visiloba.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nesajezefatifodejexefo.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/9244513659.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/56847084319.pdfIn PDF document text
    • http://tayles.com/uploaded/10571275652.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/62316727563.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210902_210956.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/ziwobusexetuwimowosap.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/4500820323.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/51455666631.pdfIn PDF document text
    • http://maidichike.com/upload/files/zogofulijoweduvumopiso.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e480a2dbc---butapuvupeguxedajediwezip.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/puxarox.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/647569030.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/31927147786.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/nozizatu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sekamesal.pdfIn PDF document text
    • https://begili.com/uploads/image/files/wipoxem.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1a748182---nopudadomejele.pdfIn PDF document text
    • http://silver1979.com/upload/file/gisiguwabu.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23123060753.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6869450359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=real+cricket+game+hackPDF 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_off0000ba11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 16204 bytes
SHA-256: 3722c7a76eab0d899351456270de0d1e97e93df95274396c31340754fbdf47c1
font_02_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10424 bytes
SHA-256: af031a267311f9636bde1f9aa7579f312422f5fc73d4ad17fa1d1ddfb04c2fd1