Malicious PDF — malware analysis report

Static analysis result for SHA-256 5178a27b923116f8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 02:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d768de02922d75b27753d4d90e6851dd SHA-1: 6a00e3798ff01e3b81b2b8319bfc2bccbac8e454 SHA-256: 5178a27b923116f8ed698a49f397e3912311c5fc60448c0d02981ba8a4430c55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts. While no scripts were extracted, the presence of many external URIs, some pointing to potentially malicious domains, supports the attack pattern of luring users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://natyabio.com/uploadfiles/rifedirapit.pdf In PDF document text
    • http://ffarchitettura.it/userfiles/files/womaxirikimiwawoxaj.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/taxizafaxexe.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/21337619064.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/17854213251.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/82728994884.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/70498104692.pdfIn PDF document text
    • https://cakkue.com/contents/files/wogelevakapilukavonasur.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/6233820571.pdfIn PDF document text
    • http://quetthe.com/upload/files/tedokejarifevasaf.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/gaboxolenuvaxaz.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/98605529572.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/worubiwubirefijibuzozo.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/87165632663.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vugebejafe.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/juzevavetexap.pdfIn PDF document text
    • http://merwepizza.com/upload/file/33129102771.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334927336b2---limotara.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tefusasasatuwi.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/71635486162.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/59545886438.pdfIn PDF document text
    • https://atiksigorta.com/files/mowonobebosuxelov.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/lujavanorijuvufepina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+free+afkPDF 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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 17492 bytes
SHA-256: f1c143e6fb332de97fc06ba13d4a198884e35e9695466faf510939f81401c5fd
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 10080 bytes
SHA-256: 91c2316c895b09384395604ef048f9bee089acf3d6d8917e1ce3fbcce69485c9

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