Malicious PDF — malware analysis report

Static analysis result for SHA-256 4376ad1e3cdf1508…

MALICIOUS

PDF

68.9 KB Created: 2020-11-18 08:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 32bcd45862370f2935e26723805bf693 SHA-1: 1089fd18edea24bd1422ccedf7be4d06968d5129 SHA-256: 4376ad1e3cdf1508dbdfd9bb23c4fad31f644f22f55a330be64bd53bd348fb13
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and exhibits characteristics of a payment redirection lure. The presence of numerous external links, including a link farm, suggests an attempt to direct users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt, likely leveraging a social engineering tactic to trick users into financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=backup+whatsapp+messages+from+android+to+ios PDF link annotation
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/bed566f.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/taguda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5f9f3438ce815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_5fa46820a65f9.pdfIn PDF document text
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/mobulupefuto.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/wefalude.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/jinabisura/kosipepabebefoted.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/55870700042.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/racing_rivals_hack_mod_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/read_ugly_love_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/make_no_small_plans_winston_churchill.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/34795979315.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/gapafolasedep.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/blood_draw_tube_color_guide.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_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 5744 bytes
SHA-256: 2cc807f4e32ee0051bd891f752132d5b761c1388fad3b34e8cf44e8a49598865
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 10604 bytes
SHA-256: 5febdb4266700ddc2bb10fa3c7f78b54bf394902d8686b9df554aa7b548f9c81

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