Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8638e5514c413e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 05:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd583bf8078ac7ac8644f967b60b0575 SHA-1: df299e32757b25b28bb371abd0677111f3e61917 SHA-256: cb8638e5514c413ec17bf2cfbf0c6f418876f1ccf49782853d1b04852a8f95fd
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized redirectors and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicate this malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users seeking information, likely leading them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=doogee+x5+max+pro+manual+pdf PDF link annotation
    • http://dixivurozepesu.iblogger.org/silerajafofitegugurowo.pdfIn PDF document text
    • https://tidekomix.weebly.com/uploads/1/3/4/4/134441433/benojisa.pdfIn PDF document text
    • http://comp-arenda.site/full_form_of_ktm_dukeh5a3c.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/fuliriverudosil.pdfIn PDF document text
    • http://save50.pro/sixilazulonc291.pdfIn PDF document text
    • http://prizinsta365.website/deroxomarazu6zbh4.pdfIn PDF document text
    • https://lifibopunikesi.weebly.com/uploads/1/3/3/9/133999807/7975332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofalowi.rf.gd/54312512343.pdfIn PDF document text
    • http://pogelejulogowev.rf.gd/waste_to_energy_plant.pdfIn PDF document text
    • http://pufasetidovido.epizy.com/69956112877.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/netqin_antivirus_for_android_free_apk.pdfIn PDF document text
    • http://mafofeguf.epizy.com/tarosenidujasajetok.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/diary_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/ravujeremuga.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/yamaha_rx_v385_price_in_pakistan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 3724 bytes
SHA-256: 5f506f96885c68285abb08013964e969243e5a1cdb180af6bb27fe8127c8fd8a
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 5376 bytes
SHA-256: 550b920359f1a1746366abb26cc7cdfdf8617e6beacb20722c7f9f773dd4eaab
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 14244 bytes
SHA-256: baa8f5155f385f57c2ad0a3f6bbefacf6c8fc97a3dcd8e45c7eaf4fb8603798f

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