Malicious PDF — malware analysis report

Static analysis result for SHA-256 860135fb2d39f2fb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 09:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b360a4a8a65a9ed636839f710e34650b SHA-1: 75401102a9d52cb8676101e9263d7bfe5dd0635a SHA-256: 860135fb2d39f2fb72090aa3d6ddd8c0f38b233101ba8264dec0630d5427655a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it is a link farm. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files, potentially for SEO poisoning or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://szkolka-wiercioch.pl/files/file/zidojojoselokapuxugag.pdf In PDF document text
    • https://voyageaventurenepal.com/upload/files/wozegobijukuwemovuri.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/38738500049.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/76582859353.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/69543010393.pdfPDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/gapazilupirokotixobesi.pdfIn PDF document text
    • http://cudicio.it/images/file/61026686722.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/parapuxujukakiweraxamejuw.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/75c19818ebb2869012989e7c33e3f2e7/jojuporure.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/25435418725.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/setilafeparunizil.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/sidujupeto.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/parabeninafijuwadetibukar.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/jikoropelojakeneboremeso.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/37125476885.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/petozozijeketabojokizozi.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nejezitejabowuweruwab.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///52866887635.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/77836609292.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/rebogaluxovopuzegonunim.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/turuki.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/236f073a1e2d93f2c128301fe263aa86/zajukumolemimarara.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/pepetuxamebetov.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/85011186098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+block+emails+on+android+phonePDF 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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 17620 bytes
SHA-256: c43ef8db2e943779e0bfca1abb3480a741c5b5a6e07505c982a9f12b7aa522cd
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 11088 bytes
SHA-256: c8608340a850185703b77d6ee6ae2cdb4897ec3a2c0acedc328686e0a1b9dea6