Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16ed43e51858820…

MALICIOUS

PDF

67.4 KB Created: 2020-12-14 04:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eb27f3100dfb664904d4586f602c0f28 SHA-1: 276d6629c88817e17f4bf2380c5ba88c6a824cd7 SHA-256: a16ed43e518588208e3dd3e63fb71b4b5d7d0d3f7818f7a434701d4346028438
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and scam campaigns. The embedded URL and the ML classifier strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of the redirector URL suggests the primary goal is to lead the user to a malicious site.

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.
  • 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/123?utm_term=nucleus+cochlear+implant+price In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fa7586128c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f95680244598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1583bff13940aa242bd98/t/5fc437332dd96f59187351c2/1606694708028/post_great_grains_raisin_cluster_crunch.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5326c68612547ed7a0b58/t/5fcddb7e8a55f2188b9991bb/1607326590129/domino_falling_sound_effect.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6addd0a2757459b0b5f1a/t/5fc9d25b2f5dbb44b77d0ca0/1607062108582/52252071176.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/budem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0b02c83faa584acdbba3/t/5fd6925eab7772717696b12a/1607897695572/csgo_crosshair_generator.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553bcab79f442f246f04a/t/5fcd6c94d235d37878d9de70/1607298197134/judge_timothy_c._batten.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1e09fbdb33045eec91c30/t/5fc511136457125654dc3c6c/1606750484424/fivemejakulamusebe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc149731c8c741314347862/t/5fc27d45173fb5383bf379cd/1606581573954/massabesic_middle_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/book_review_format_ks3.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_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 5144 bytes
SHA-256: b2564b0f43f97401a15dd2761d928f12d50f89b05d24ee91007276cfe6875615
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 9376 bytes
SHA-256: 757691b9b0d3e90e8c21a42e0d776eaa5553575b1d6c07f2c69f787eb713d0d7

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