Malicious PDF — malware analysis report

Static analysis result for SHA-256 991d1cb4c5d62a52…

MALICIOUS

PDF

69.5 KB Created: 2021-01-01 19:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bfc1d914d1f4e6a6b05adc07b1354df8 SHA-1: e6c87e358139a97e9ef26f0ff1d8d298efa8789d SHA-256: 991d1cb4c5d62a527c2db63d6f2d9c8428e99cd559dafcd0db0a7dbe09ac2c64
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. Although no scripts were extracted, the presence of numerous external 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 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.
  • 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://ggtraff.ru/123?utm_term=panic+in+detroit+tab In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481270/normal_5fe230a4bf6ef.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/jel3vja/texas_holdem_poker_offline_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f9cbf0c8cd7b.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/bimitugele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420617/normal_5fcaa7ff095d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419826/normal_5fc7632ba8a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fe32003bd393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9d8a88-1eb7-4e47-aba6-5fc153be8e9b/nipisaravojer.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/12178101531.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/kazininakujekugi.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/camscanner_for_android_mobile_free.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/pojedubazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57091b7a-4260-47fe-9cc7-1441886b8f60/sc_dmv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/words_with_beautiful_meaning.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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 4864 bytes
SHA-256: c978077054fc5560ad1e4c13cdd5cebd10a9cd86567afb921981f90d3c22b198
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 11100 bytes
SHA-256: a574c98464055297974cfeadebc73bebb599faaa39a1b591d2b2713b27d1ddac

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