Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1d91effce22b84…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 13:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d35239bd0b82b2738579f4225b53fc30 SHA-1: 7c55e5018ad71256449147cb6feeaf7f64f2fc28 SHA-256: 4a1d91effce22b845e7c76be982af5729498f8bf8b05676584ef4ddc1b835679
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized redirector domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a pattern of creating link farms for phishing or malware distribution. The embedded URL and the ML classifier strongly suggest malicious intent, likely to redirect users to a phishing site or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=payroll+accounting+in+tally+erp+9+pdf PDF link annotation
    • http://dakajak.medianewsonline.com/xaliso.pdfIn PDF document text
    • http://kurs1.xyz/77151838232f5uz.pdfIn PDF document text
    • http://leafester.online/cognitive_behavioral_therapy_for_anxiety_online99fr6.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/36624687418.pdfIn PDF document text
    • http://sodalabs.club/citizen_nighthawk_manualnsxa0.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/from_common_sense_thomas_paine.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/pobixedele/dynasty_draft_2019_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3435175b-9d76-400f-9574-b6e3e77c1337/milud.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/78322774885.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/bigew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709e5c09-441c-4744-bc8b-c2be32a6e552/74127128524.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/zunepetubitudatutokutenun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1932978f-18b7-4477-a279-b520c79d1ae0/java_spring_mvc_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2cc77f-0404-4508-a5fe-8b5639770b9c/ccna_routing_and_switching_complete_study_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/wogesavajowajumirixusova.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/jebotefetogewamebabun.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/wamofoguxalava.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/autocad_2019_crackeado_64_bits_portugues.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_c9c154f639384ad3a7e71af8401e538e.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_5751acb76bb74f389112311c81948606.pdf?index=trueIn 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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 5404 bytes
SHA-256: fa80ed1320a68f00dfe3903adee84f979d730b1351c769d00f4bd31dfbba40e1
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 11068 bytes
SHA-256: d14a2f2b8873c7b8e44a0a32b8eef38a64eacf0e3488996327abb21b40a67f43

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