Malicious PDF — malware analysis report

Static analysis result for SHA-256 a088278e4cff517a…

MALICIOUS

PDF

90.4 KB Created: 2020-12-17 18:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 391aeae8404a8b7325cb6b81fc540e1b SHA-1: 9da91543c9315681ffd0e2f44c62558480264fd3 SHA-256: a088278e4cff517af8c49ffa1b24bdce0a72df2ddbd76366fabfc9a1487b9673
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and one identified as a malicious redirector. This indicates a phishing or scam attempt designed to lead users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?utm_term=the+breakfast+club+mix+and+match+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd25ded3a7a.pdfIn PDF document text
    • https://mabiredozex.weebly.com/uploads/1/3/4/4/134482212/4429452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_5f9edb68d9220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5f92e51cb39b2.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/6190003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_5f9d920f9d0ce.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/621f70ebfb1f.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/2751395.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/rafenuf.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/5fc7281a579eee3ae06c48d5/t/5fd0e43b06d21916ed79a92f/1607525442647/72932926297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458b9453-de77-443b-94ce-86560d3f5283/211227325.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/g_minor_scale_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/livro_capitu_e_eu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/human_anatomy_8th_edition_marieb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d43658762305c0f49b3f/t/5fce8d8616b71a05c0619255/1607372167696/nopelazedap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 5572 bytes
SHA-256: ce654e5a752b00c62b1efe452d0390366396595a59801a0c8750773150d720f9
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 11372 bytes
SHA-256: b2344e3cc887a85fd3b79d407f31060761b00c3796c04ae2b6cf323b927bc38f
font_02_sfnt_off000146ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FF 16068 bytes
SHA-256: c7c611a16aca8c876ec7f97a95d4cc6c264668c6028af10316f7707a452d992e