Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0b77e259ce1ee8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 06:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09b38200f06d1e8a20f8e07f9e2b4b6c SHA-1: 1c8444183edce2b6e2c403bb82df5f73f35e7496 SHA-256: ab0b77e259ce1ee8e29ad6bacccac835d171b10ee3b7bfa693810408a8148a0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by heuristics as a link farm and a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to the overall attack pattern of distributing harmful content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=score+hero+2+120 PDF link annotation
    • http://abbeytraining.net/userfiles/file/12039752016.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/fidefobesasakarukasofu.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/vomifekoduvewagex.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/86847370174.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/dumotuvud.pdfIn PDF document text
    • https://ubranni.com/uploader/files/rupodetuligemavafuwugal.pdfIn PDF document text
    • http://ailizia.com/userfiles/datepozirazufudaw.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109041248077778.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/53780457129.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910185327.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a1300108d---vabuguwefatop.pdfIn PDF document text
    • https://interconformity.ro/images/file/70181790698.pdfIn PDF document text
    • http://cpils.com/userfiles/file/32972437338.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/birevajujileduvu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/65214536777.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/watekew.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/22881758600.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/nisaveperarugixabepolola.pdfIn PDF document text
    • http://clerus.hu/files/file/833508621.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/46173702344.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/7172172807.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/fozelikawajit.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/pumelibitive.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_off0000b318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB318 10024 bytes
SHA-256: 495aa22492e459e81796609341d3b72d446cf0bcc4fd1282c9291eb528833fa6
font_01_sfnt_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 16656 bytes
SHA-256: 149bae13d0b73a13790a52c4564ac49a5e85e15ea158563fa4558f1bb8e48df2

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