Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6ebcf6089529e3…

MALICIOUS

PDF

82.4 KB Created: 2021-02-14 15:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d726c963a8a4c98fe3f277b3a939a54e SHA-1: 25b45491f0e25c4d62b10c7c74dfd3472dc43349 SHA-256: 8e6ebcf6089529e33a1af32155a113b1e2e8e89d3409eb984e25f1ded89558c6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on suspicious domains, indicative of a link farm or redirector strategy. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest a malicious intent to distribute further malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common technique of luring users with seemingly legitimate content to download malicious payloads.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/wix?keyword=civilizations+of+ancient+greece+worksheet+answers PDF link annotation
    • http://azorocheat1.xyz/393262436256g4b6.pdfIn PDF document text
    • http://myfirstsite.xyz/fuxetuxoat3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_60185dc7c76d5.pdfIn PDF document text
    • http://probkin34.xyz/mirobubezakawojuvomoke99rvz.pdfIn PDF document text
    • http://topstop.site/352536699222c1yt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_60102abf49fb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_60052b40ca6c1.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/sebiwevogakifig.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/lilotun-gukumidir.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/82611321035y7xks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601bebb20a3f0.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/liwara/67663514379.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/homonyms_in_tagalog_worksheet.pdfIn PDF document text
    • http://vutuzirowu.rf.gd/google_account_manager_apk_6.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/deforestation_facts_and_information_national_geographic.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/insert_worksheet_in_excel_vba.pdfIn PDF document text
    • http://sajonagot.rf.gd/anime_slayer_apk.pdfIn PDF document text
    • http://buzuvemujogumob.epizy.com/58214260066.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_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 5312 bytes
SHA-256: 73ea583aae745710febbba42f07e82978d60133cd889593a0b9d59018d975496
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10240 bytes
SHA-256: 0ce8f9349e9c66a35f9f7673bbe797575963c7b812b0cbd60ce5395fcd9378b8

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