Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cc83d4904f96d3…

MALICIOUS

PDF

78.2 KB Created: 2021-05-06 23:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cf7ace9a6bffb51f04b43fb63ec9d6fd SHA-1: 55ea4e303a135f833ca53c76919768f93b791c96 SHA-256: 19cc83d4904f96d32c2639f18f090454ce75d6cc1a3c49b9165744a18a01486a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with numerous URLs pointing to disposable hosting and redirectors, indicating a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=what+is+the+average+salary+of+a+surgical+nurse PDF link annotation
    • https://cdn.sqhk.co/pikikunifav/gdgigev/28858758730.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/biofertilizer_production_technology.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jchiujc/42999603012.pdfIn PDF document text
    • http://itdiscount.info/65449157720mr4a2.pdfIn PDF document text
    • http://tixshopclub.fun/grigori_grabovoi_methode_book71x76.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/98681975283.pdfIn PDF document text
    • http://bachanalytics.com/62948696851fdi4i.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/bjivG5L/wonafudagevukuwen.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/9rijhij/walew.pdfIn PDF document text
    • http://maxist.ru/contabilidad_de_costos_estado_de_resultados_ejerciciosr4yhs.pdfIn PDF document text
    • http://soldatskaya6.ru/how_to_get_couples_counselingsva9t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba27d35-8a85-426c-a7c8-90608795f7fd/92692611878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7baec4-6a00-4ccd-91d7-4f9a7a7b2a65/japojera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2496870-b80f-4b52-8e50-3f3839d1eac8/how_to_get_marker_off_textured_walls.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/kovupemomijidewulesid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a22c16-31ac-4733-93e8-6e7af40ee210/inkscape_for_mac_m1.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_e2bae42446384c56b16d226443ce4089.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_8c48837751ed4042a21432baa747d5d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc747cf7-58b4-4593-88d4-79ed2bd015e8/saxudaxizawazusiwudutowig.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/bedwars_blockman_go_apk.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_a155fcffa73e4d8aa2db77679dffdd0a.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_39e082cd7c054df5a8716c2223e08983.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_7a874d6e8dc342428e471ed0a15361fa.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5320 bytes
SHA-256: 17756a8bb71d477ee2d23c1909693bbba24b63c2d4f2a185a11ad598b2f85b04
font_01_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 10792 bytes
SHA-256: 161416cf941124d902968144d2aba220ae285d3881b74ddfbddcce1356d38684