Malicious PDF — malware analysis report

Static analysis result for SHA-256 e808067a7ce8883d…

MALICIOUS

PDF

100.0 KB Created: 2021-03-27 14:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 32b48d4a7d6c5096ffa63723fa71150b SHA-1: d21775dcac22a4d15cd37c3174d0130ec550e859 SHA-256: e808067a7ce8883d842db853d610c5bc8411fd014d7b859d41be3cd3fad2ede8
244 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 suspicious or disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. One critical heuristic also flagged a link to known malicious redirector infrastructure. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it with high confidence. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/award?keyword=phenomenology+and+virtue+ethics+pdf In PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/bea1161c039.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/2892904.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/O9BgcMl/juradulafepokebonu.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/088202e1.pdfIn PDF document text
    • http://tederurokeroga.iblogger.org/ds_160_form_guide_travel_information.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/9f4fd9cf0cf1df.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/f71hdke/panic_alarm_system_for_home.pdfIn PDF document text
    • http://voninizi.iblogger.org/55781747244.pdfIn PDF document text
    • http://zikizitepef.iblogger.org/11140930365.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/7975340e-04fc-4ee8-94f5-a5d0c7e64dae/82012231198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5afce4-6cec-492d-9e05-e8abc57da6c9/28128946228.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_539c280d378448faadc9dcc6aa29f3ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd64f30f-92c1-4b62-96cc-566b9ceb94c2/tp-link_tl-wr710n_v2.1.pdfIn PDF document text
    • http://lekinip.epizy.com/catfish_farming_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98dcd680-70ff-4ddb-938a-893d23614832/head_first_pmp_practice_exam.pdfIn PDF document text
    • http://forawoxo.epizy.com/poxiruvajoziraretetim.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_6e3f120067664517b2efac337680d147.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/275fafd7-cc3d-4bac-b7df-9b358c6866e5/zaturedoperefapigovobavob.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_off00013d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D79 5616 bytes
SHA-256: 5a277ce8ff26f8474a5a09ddaf9c4f9e456d8fccd31fd3c1ef117ff46c965af0
font_01_sfnt_off0001506c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506C 10604 bytes
SHA-256: f98233771a1b0f587dc320109635b5b14d0c913932f258f5a3b4a1e1f5ce35aa
font_02_sfnt_off000174c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333