Malicious PDF — malware analysis report

Static analysis result for SHA-256 f318a75c1014aa71…

MALICIOUS

PDF

76.5 KB Created: 2021-03-08 20:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1614bcca73b4edef44799afd81dba1b2 SHA-1: 2e9cb1e12ce6caedfd602b5608681916c7b7c4b3 SHA-256: f318a75c1014aa71fa1eee63329dd3f9694fc78ba6771433fcc8bd62d884ed19
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to lead users to potentially malicious content. Heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious classification.

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
  • 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://crophysi.ru/aws?utm_term=how+did+vacuum+tube+computers+work In PDF document text
    • http://detonicinitalia.website/samsung_note_10_vs_mate_30_procfrol.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/6365749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_6005fb5de25a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_5fd14afdbe960.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/4180053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd3511c32e3e.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/how_to_check_your_birth_star.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_602ae1381c498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_6041a11c7c1ce.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/kikanafila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463264/normal_60072058c1dd6.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/70287271692.pdfIn PDF document text
    • http://theraisins.pro/zojedapufobevizitozet3tdnk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_60427283c26fc.pdfIn PDF document text
    • http://file-id.ru/amona_tete_mabo_free3kod0.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/juzinaramip/54675986898.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/world_of_darkness_slasher.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/minoxidil_in_natural_form.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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 5504 bytes
SHA-256: 029fc78e7ab6aa6efb242006b96e22b634f254ee708d8858dc438bac02ffb873
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 10512 bytes
SHA-256: 6a3840b113f26194f2c687c8fbac30d1113b90918f2862d3b6059ee682c62d5c

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