Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8a979119601a7b…

MALICIOUS

PDF

75.3 KB Created: 2020-11-13 15:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a7e9c0d12d86e0c47891f59fba1350f6 SHA-1: e4135fc6dce09b372849ee4703334f3991661cd7 SHA-256: db8a979119601a7b9725c38da6167fb89519e267b557ec124b16954338c45f69
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many pointing to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'business analysis test questions and answers', designed to entice users to click on the embedded malicious links.

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
  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=business+analysis+test+questions+and+answers In PDF document text
    • https://pusemajipi.weebly.com/uploads/1/3/4/4/134471733/taniw.pdfIn PDF document text
    • https://fasefipuronupa.weebly.com/uploads/1/3/4/4/134471496/relix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_5f8fa23cdac8d.pdfIn PDF document text
    • https://wipaluxeko.weebly.com/uploads/1/3/4/3/134346688/ba480af22ae78.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/rivazixexuguri/bivenogajobudafutanevis.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/harlan_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/bandicam_pro_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/1548579586.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/words_with_endo_prefix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e24705-e396-4198-a22b-2c5c7be25cff/ley_29783_en.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/11614902076.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/16261419219.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/types_of_probability_and_nonprobability_sampling.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5188 bytes
SHA-256: af8dd72ddda2e354de0b12054a7d63a6fdb8edcf1e6529185e621c06b81b38f1
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 10980 bytes
SHA-256: d6fbd4e7ef4400ace4e144aad10f2fe58f343844ee150a39129f673c916f6ca0

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