Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea50203c7795aad…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 04:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51a4caccc758c1dd2ad928928625cb34 SHA-1: 780cd9ec5bea91d5a170ad1c54674de4e09f0df4 SHA-256: fea50203c7795aadba8156fb9c879f4091e54e195660e11a761a8722477e7cea
184 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to maps or potentially a scam. The presence of embedded links suggests an attempt to direct the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=world+map+with+oceans+and+equator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_60449f80bd49e.pdfIn PDF document text
    • http://labiosdewonda.com/301685952566rxxd.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/zewexitapofunusanifopuf.pdfIn PDF document text
    • http://7lessons.space/free_fire_tournament_app_downloadhqsbt.pdfIn PDF document text
    • http://zosuwalerikare.getenjoyment.net/90254399125.pdfIn PDF document text
    • http://hookup673.site/119320201872vls3.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/79006420108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_601d244dcac00.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/gfhciha/solitaire_engagement_ring_meaning.pdfIn PDF document text
    • http://kawlites.online/what_are_descriptive_words_that_start_with_ed09nw.pdfIn PDF document text
    • http://brandframeb.com/gleichungen_lsen_klasse_7_aufgaben2keha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_60380c4495df7.pdfIn PDF document text
    • https://cdn.sqhk.co/bofotabi/yidggnI/foneganiwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_e3fb31c89f1e4aaaae2f213e46ef3b64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/42675290761.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/31722837834.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_389f7a94b3284a149d9aaa7d95d4d4a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegek/pcb_design_rules.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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 5544 bytes
SHA-256: 16216f63eb3dc6e13026f29877cd23da19269b4c2fe2e0fcd78586f7b4b3ecbc
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 11072 bytes
SHA-256: 8586c3b0f7d32f95c6be13336a5f8b3746c74af5283287fd379753e1c77a9416

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