Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f44f8ac550afba…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 00:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9fdb1d7615fd99b2f338af59156d17a SHA-1: 9d113e3a56eb457cb988bc113d9a02bb77ebfaf6 SHA-256: 29f44f8ac550afba364617829bc9e24559d52b3c20e32512c4e357d288988480
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hohsingfiber.com/ufiles/files/zobanaviwapesenakiwuw.pdf In PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/kekepijafavi.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/77834628380.pdfIn PDF document text
    • http://pronobile.de/catalog/file/jamanexajetal.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/46385525703.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/tixofawidezazejefiv.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/9948cut8nkg6mi82jttnk04k37/bifotomulonivepo.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/buminunub.pdfIn PDF document text
    • https://akemi.ro/hirek/file/41374019070.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/pilewetas.pdfIn PDF document text
    • http://strandedtattoo.net/file/53750323524.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/59009438330.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/xulolo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/kewuwikedelegoxakuveb.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/23417959932.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/17853054118.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411344bedf1---30613402176.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/wiwiwe.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/35668574256.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vixufonedozuvataxali.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/68224086178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+zareklamy+appPDF link annotation
    • https://lapdonline.org/file/puwizabugawodiwunapego.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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 18052 bytes
SHA-256: d303f46aa49fba2435163048f1f76d03af520ea0c7ea02a0d234f52150f75217
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 10548 bytes
SHA-256: 4eba9c6a5eb9e13dce7fea6724ebb9bd3f0ac62bbfae0be8023b3716bd634a1d