Malicious PDF — malware analysis report

Static analysis result for SHA-256 679ac4f7b3853b1a…

MALICIOUS

PDF

292.1 KB Created: 2021-02-04 05:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d2091b439bba3c7e757821db0c3a330d SHA-1: e0ada602b64412fca116c6cd32dc45836cbac449 SHA-256: 679ac4f7b3853b1aa161a6809910587ad36a8b4c849533a339572c4b1f4b53d9
194 Risk Score

Malware Insights

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

The PDF contains a link disguised as a download for a "New drill manual usmc", which is a common phishing lure. The link points to a known malicious redirector infrastructure, indicating an attempt to lead the user to a malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9831

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=new+drill+manual+usmc In PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/704a83999a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_60127ca2848e3.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/6051508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fcf8713edaa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_6016150092f6b.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/fuwunotabazowamo.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/64388c9a9c453e.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/gasinemawopowulubima.pdfIn PDF document text
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/c5c595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_6012c4c272618.pdfIn PDF document text
    • https://tekagilodepini.weebly.com/uploads/1/3/0/8/130813992/vabafif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fe87463e88dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd7d780995c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5febf39a11766.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/b7182f9f46e496.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/panosal.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/dafogen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off00043db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43DB3 4836 bytes
SHA-256: 852adca05a9753abe763f1e11b3e5dd42a9f75cd2feede1187029f079fe3049d
font_01_sfnt_off00044e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44E07 10900 bytes
SHA-256: dcc654c6c73cc285d32f87db2974c9f12d16d5fb2882f43c3dd0e07b798ca2fa
font_02_sfnt_off0004732d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4732D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e