Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bddc1588fe2e92…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 22:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 69914e73c8e37ec6011c91c17190130d SHA-1: 2500487a099cb2c280874b4766a41231aac00bde SHA-256: a6bddc1588fe2e92e04830d0ed094efbefdae5e87ee6d9d8e5b131b1b57c9f3c
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution scheme.

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.
  • 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://crophysi.ru/wix?keyword=latex+leotard+with+sleeves In PDF document text
    • http://poradoit1.site/fedewuxise7z1zy.pdfIn PDF document text
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/dabodenonigukin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_6022ef31954a6.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/lujizixijibinelajox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fe88ef1341c1.pdfIn PDF document text
    • http://static-start.top/79705468840myfqg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_6004b3beed4a7.pdfIn PDF document text
    • http://netewe9.xyz/adding_and_subtracting_integers_word_problems_worksheetswregm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6016782d24636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_600ecda88ad2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5fd2eacbd101d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_601781cb093ce.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://zebinagapovu.epizy.com/two_items_found_in_the_anglo-saxon_burial_mounds_at_sutton_hoo.pdfIn PDF document text
    • http://lekinip.epizy.com/ditupolulojip.pdfIn PDF document text
    • http://fipotunisobojow.epizy.com/graco_duetconnect_swing_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659278a3-09df-435c-8e76-e5100fe5b465/12202614828.pdfIn PDF document text
    • http://jilutuve.rf.gd/android_studio_sharedpreferences_save_arraylist.pdfIn PDF document text
    • http://vikogen.epizy.com/73322365954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be1d5bc-eaf6-41de-b8f5-95fc02fe5dd5/ziwumikeden.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_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 4756 bytes
SHA-256: cce687d7172d7c6c8851abc3e54c93e308b50950325815ab6b02f58164d96c7d
font_01_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 12484 bytes
SHA-256: 7b7046fce7fd39948c46b65bae97cc4461e252201a99a8f14fd3b357159a9fcf
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230