Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c11dfe2639a60af…

MALICIOUS

PDF

70.8 KB Created: 2021-04-27 15:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f552451011b662da56c8a86515325bf4 SHA-1: 29dcedbeeb1b8e499415b7a1e49d1c141ae970f2 SHA-256: 8c11dfe2639a60afd3cfdb197206f9d2666cdcc2781fb685d71288e83d7c657f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains or known malicious redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the nature of the links suggests potential for further exploitation or redirection to malicious sites.

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://dafemum.ru/strik?utm_term=best+home+workout+for+abs+without+equipment In PDF document text
    • http://tumerasiwabuzip.22web.org/29288123297.pdfIn PDF document text
    • http://muzoc.xyz/vekilerekurateletikugekowx484e.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/5413755.pdfIn PDF document text
    • http://bestunew.xyz/how_to_do_order_of_operations_in_math1awof.pdfIn PDF document text
    • https://dotijude.weebly.com/uploads/1/3/0/7/130740148/bidevir.pdfIn PDF document text
    • http://bezigex.iblogger.org/gipuzesitiwe.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/a928b08dc6aa.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/4656071.pdfIn PDF document text
    • http://martans.space/scratch_2_for_ipadtjqqs.pdfIn PDF document text
    • http://photoforce.ru/el_principito_pelcula_1990nwmhd.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/rerufixelifur_tavuzozefu_jagaka_gapimerexu.pdfIn PDF document text
    • http://big-ita.space/bsc_nursing_4th_year_syllabus_201912u5h.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/2880828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bac49e-60be-419e-82d2-9542369b1d78/75913038432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b8da7e-2435-49e7-95ac-7f22d60edf66/lovaridetub.pdfIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_874700e7f7134a3096cb9157522795de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab9249e-1143-4178-9979-548f7c6eaee7/54172229106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914cfd1d-2823-440c-b18b-d33f3e41598c/doro_mobile_phone_for_elderly.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_794c94f24bc244bbb2da25420a3e077d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43bcac28-c9b1-4296-af99-9a00b0409e84/xulumupudekavux.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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 5580 bytes
SHA-256: 23dd1799db29d08239accee9b2a307020d72f95589d6e88a10654f34c95f15e9
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 10724 bytes
SHA-256: c62a96c4b5d91a6889eda9fc6d12f2cd60185dafe8db61d03e798f44ba57c66d