Malicious PDF — malware analysis report

Static analysis result for SHA-256 4678a9aa440f87df…

MALICIOUS

PDF

67.1 KB Created: 2020-12-02 16:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 35d9d2318a35696cd46477dcbc9e8ae6 SHA-1: 3b92e609ee94772a771c0ed5b5a2e34575a30912 SHA-256: 4678a9aa440f87dfda77267b6be061d884fff55679c4d54d050d68c11c310eed
304 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious phishing lure, specifically impersonating DHL. It embeds numerous links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to balance sheets and application metadata, suggesting a lure to trick users into clicking malicious links for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xegiwegaravobus.weebly.com/uploads/1/3/4/0/134017761/30a7ef06.pdf.
  • 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.
  • 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://cctraff.ru/aws?utm_term=contributed+surplus+on+balance+sheet In PDF document text
    • https://xegiwegaravobus.weebly.com/uploads/1/3/4/0/134017761/30a7ef06.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/xududev-ledavodu-jatulivarolaxe-bixebenal.pdfIn PDF document text
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/992dd426b2.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/3460351.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/e10fbc1dcc9c.pdfIn PDF document text
    • https://geligike.weebly.com/uploads/1/3/4/5/134590657/3991096.pdfIn PDF document text
    • https://nabisipiguges.weebly.com/uploads/1/3/4/4/134432296/9ecddb08dd.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/5fc2ef221452f90b7ff27d3c/t/5fc63b3ae18c5c478ecf06f9/1606826810700/summon_dragons_redeem_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95381c5-2fcb-426c-a4d6-5ce25fa39803/tobolojuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46ef7c7-ad33-4157-b26d-453a28ffaec6/zetusumomixesezepirebax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455c23d6-ddc1-47b6-98b5-6f958d7332a9/fallout_3_cheat_terminal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ba6ac89e1c4b8fbd7cfc/t/5fc12e463570fb44d12d7742/1606495814865/21._manageable_span_of_control_refers_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcfbafc-9ad2-4475-9559-acfcfbaec79f/pancharatna_kritis_lyrics_with_swara.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_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 5208 bytes
SHA-256: c7d60b13cd147ca8b66c1ef4c6be8a071f300d811b9541f00c1ab7d70640ad7d
font_01_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10428 bytes
SHA-256: f535e1a0cad04075269850aa3484c8d8eef3958d422f4443e9887d756ada4df4