Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d8ba1c6fb46aa7…

MALICIOUS

PDF

85.5 KB Created: 2021-04-19 00:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 999c0ceb44b4e555bdac112806277878 SHA-1: 12998a8b49831f546c9487de5ded41f9b2389628 SHA-256: 50d8ba1c6fb46aa72d527f24319cbd042ea2c7db235191343d1921e0b61e393b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external URLs points towards a potential redirection to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=will+carb+blockers+keep+you+in+ketosis PDF link annotation
    • https://cdn.sqhk.co/koluvukirate/rXzjfjh/badlapur_full_movie_in_openload.pdfIn PDF document text
    • https://cdn.sqhk.co/birifoneboj/7qhbGhW/bilingualism_in_linguistics.pdfIn PDF document text
    • http://fekijijiz.iblogger.org/simplified_badminton_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/fhd2vsH/1201387611.pdfIn PDF document text
    • https://zegokovoni.weebly.com/uploads/1/3/4/3/134323662/ace502df6e29.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/fcf673232ad8.pdfIn PDF document text
    • https://cdn.sqhk.co/zevivovakok/nsaRO6g/it_chapter_two_pennywise_final_form.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/cggfcfD/6053781583.pdfIn PDF document text
    • https://vilaluwavo.weebly.com/uploads/1/3/4/3/134338374/bubaf_zebusitoxidaxir.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/UXt3iaj/tirokuzedariparova.pdfIn PDF document text
    • http://norasidifonilov.22web.org/38635723271.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/ajiPhhv/73072061845.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/VogjPje/6908712642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabetalofel.epizy.com/47223319359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0f2e11-4427-461a-b608-a7a611e30274/how_much_does_a_data_scientist_make_per_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/55246632325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0bd889-91ac-4b64-8b4c-81d7e88f621c/local_area_network_settings_disabled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164883cb-2451-448b-8f0f-dc00dd3f6932/flysky_fs-i6x_simulator_kabel.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/6_times_tables_printable_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1151a03-5851-42c4-a193-f54cc0b50382/ford_f250_repair_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 5244 bytes
SHA-256: cbec2938600d6d4a6947027db390929a30757db56dfea8e4e71b8eb5c419f383
font_01_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10492 bytes
SHA-256: 9d82861bf56ab1ed4b1a7dd50b495ca91bfdf9ba8f7fa456426ade45454ee6db