Malicious PDF — malware analysis report

Static analysis result for SHA-256 1255deb3ff02c51f…

MALICIOUS

PDF

74.2 KB Created: 2021-05-21 01:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3f2934449e9a68996efd057b11470c8 SHA-1: 7c7e26247624c8a35f16c081ea80c0d7a1be9652 SHA-256: 1255deb3ff02c51fd9357a31cfe875e3348885238fbc7bbfc8893cc8f094c871
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 redirectors designed to lead users to malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive content.

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://jumiwimov.ru/strik?utm_term=working+principle+of+capacitive+humidity+sensor PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5fe00117c0bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6022dadb191a6.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/faxakinonitipomon.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/668975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_606024d1ce72c.pdfIn PDF document text
    • https://litapofigiwo.weebly.com/uploads/1/3/5/3/135349015/xipezaxume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6049696282991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383688/normal_60009a572131d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fffb95dd5e49.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/meludav/dujasalowaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/30421176711.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/dunujinojisukozenelolipab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a516ad0c-d525-47a0-94ca-2bf9dfe00301/vilokuzun.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/how_to_make_removable_vinyl_permanent.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/suliwamifixokudika.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/we_were_liars_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaaf72b1-6153-405b-9137-d7e923547039/80289644668.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/telecharger_catalogue_marjane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb8a926-e46b-451b-bf7f-a5c3dbba53d9/48678380606.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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 5808 bytes
SHA-256: 2a389b49a3475c7ea72e8495944aa6e184077cdea1fd89d7727225e7594c962e
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 10120 bytes
SHA-256: 052e6781977e50cb883ebf1a15fc2f05ba3fdf80b759af2b1bcc0b293897af03

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