Malicious PDF — malware analysis report

Static analysis result for SHA-256 56105fd09c5be607…

MALICIOUS

PDF

73.2 KB Created: 2021-02-18 12:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e1001b9bb40c5e8a29d1838744bfe046 SHA-1: 80b8cf363e798756743af89238baaad646e6a65e SHA-256: 56105fd09c5be607ad857b0f7caf367df153a5eadf28287b46b0ee22ff7cb429
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable. One URL, 'https://yafferge.ru/strik?utm_term=what+is+long+covid+nhs+scotland', is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+long+covid+nhs+scotland In PDF document text
    • http://itmax.info/allen_bradley_micrologix_1400_manualrok5a.pdfIn PDF document text
    • http://petrol-v-pol-price.site/60862796051c5vk7.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/c1509dde9ce548.pdfIn PDF document text
    • http://begdas.space/2008_hummer_h2_repair_manualanc8o.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/hbDgchd/nawoxuzivaj.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/OVoicha/kelifa.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/5156102.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/dipexir-setuvoxorurumiz-nobotoma-gizapetemotaj.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/jeKJF1b/34082964955.pdfIn PDF document text
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/e3479b98d600.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/705302.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/ghaSWHQ/harry_potter_hogwarts_mystery_clubs_day.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/frvhbwD/business_card_for_board_of_directors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kosamupim/52499507681.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/carpal_tunnel_syndrome_patient_handout.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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 5180 bytes
SHA-256: 8fd343e56a9a6b65b6a8d3bd423f0c511902bf1f54ac12536e6498021a7725ba
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 11120 bytes
SHA-256: 2fc0f4b52a872b01762cbc3d7bcd0c644f9264f21a53c6ede761c0c7a9d4c476

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