Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7ad43e76926821…

MALICIOUS

PDF

76.4 KB Created: 2021-01-06 09:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7aecd50e35f4f5c51db67db5182aa03b SHA-1: d1cd0ee1b7568935df32cc27c9b902d24be41ad2 SHA-256: eb7ad43e769268213bd7bef6a6c02e4a3decb0c34427cc025578d0c4f123713e
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious activity, including a critical finding for a malicious redirector link and a link farm. The ML classifier also strongly flagged the document. The presence of embedded URLs and the lure for MFA/one-time codes suggest a phishing attempt designed to harvest credentials or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://traffmen.ru/aws?utm_term=free++skype+for+business In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_5fae69bedab8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5f959b503dad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5f9cf9147d8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8cbd566d892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd1a9073b417.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/68fa0169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8eb45747fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_5fb688fcd3420.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/d70952458dd970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fb5b84c943e1.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
    • https://uploads.strikinglycdn.com/files/57e847f7-0f3a-4db7-8cbf-a78e805ef0a4/100_migliori_canzoni_italiane_di_sempre.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/produccion_de_bacillus_thuringiensis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9bf2f4-1b67-4ed8-a3a2-96805b719e1c/melbourne_tour_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc247701-d7c1-44b4-8235-3c41f20447fb/equations_with_variables_on_both_sides_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b574204c-dafe-4f01-a1a8-4e9b42b939a4/88857329146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b09ae2b-e948-4eaf-9389-40529e533176/how_to_become_a_fly_fishing_guide_in_montana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 4716 bytes
SHA-256: b1d4f0d257513b5cd2c36ca2ecb6c32d4f8e83f1447fda9cb9636a246f85ec8f
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10300 bytes
SHA-256: 7b1b5a0d3790a681c53f7bc0f2ff2c3805dbdf80242b8a3fd6d9f7242c7175ba
font_02_sfnt_off00011605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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