Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a87ae737910f524…

MALICIOUS

PDF

72.0 KB Created: 2020-12-25 14:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dbe76a1b96d962bd1d24da0806ba5bf4 SHA-1: 9439758e06c669ce09a93b436f99b8f6d7c72226 SHA-256: 0a87ae737910f5242967592b54def9ac7ac4ae2270f8a1f2460f39a538e969c6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to SEO redirectors, suggesting a link farm or phishing campaign. The primary URL identified is 'https://traffset.ru/strik?utm_term=square+word+calligraphy+generator', which is likely used to redirect users to a malicious site. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, along with ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=square+word+calligraphy+generator PDF link annotation
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/beliperuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fb68cf9baedf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fbc144fb4cf4.pdfIn PDF document text
    • https://cdn.sqhk.co/faxiwapa/hdETjgd/98681776131.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/hzhdhgs/34529517905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f87b080ef9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_5fa70241cd56d.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/5bbac65d-3ce0-40a9-b6df-632d0a2eeea3/51658225572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e6c9b2-f2b6-4f88-a26f-4e591cc172fe/legejulasuwijazufedozef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c843f402-f73e-489a-a2b8-ff4072c62abc/kutogezevegematefiperu.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/format_cd_rw_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd2739b-809d-4958-8fcc-2a1283b210e0/figure_20_1_the_heart.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/61963761717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e3eb34-99d6-475b-be16-5110e4acb7fd/the_upside_down_kingdom_summary.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 3448 bytes
SHA-256: af9851e8c5ae7f8a86e3ac922d41bab12eb6a3df323e23245d215c8d4eb26ca2
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 5580 bytes
SHA-256: 390a1e09872f8614616616b67d558c42564c6c07c3a61450642aa4ec7f619452
font_02_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10704 bytes
SHA-256: 34f19ec4a364af248e0108c0941b81f1ef53350e562a0fcc7ba85b0b0fbd405f

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