Malicious PDF — malware analysis report

Static analysis result for SHA-256 554a32659564fbb7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 06:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6fdaf85bfef8a2ae5be9ad872c9b8c2 SHA-1: b6bf571a5bd8e41455fa6a2a5c5e69593c43f3ae SHA-256: 554a32659564fbb72cfd8ee21e306b056d86498f342e314b5a6954187fc1fbd7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/123?utm_term=used+to+vs+past+simple+worksheets+pdf
    • https://cdn.sqhk.co/gidenateg/hgi64tq/detention_officer_training_texas.pdf
    • https://cdn-cms.f-static.net/uploads/4465386/normal_605432380da0a.pdf
    • https://topipanonotege.weebly.com/uploads/1/3/4/6/134679812/simojixofawa.pdf
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/5959928.pdf
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/xuzim_sakanapabavi_sidezadesi_ragidik.pdf
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff447a6c6de0.pdf
    • https://cdn-cms.f-static.net/uploads/4529149/normal_60295e56ee128.pdf
    • https://cdn.sqhk.co/tovozovuzedu/dihiaHs/rabuwufa.pdf
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/pokozum.pdf
    • https://cdn-cms.f-static.net/uploads/4459780/normal_601dea53623f1.pdf
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/nosevolapipuzose.pdf
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/062e0ca7298.pdf
    • https://cdn.sqhk.co/xidupesijij/6XHzlhc/72219635772.pdf
    • https://cdn.sqhk.co/fegojujor/g4dgege/tidimabedixaxibanewi.pdf
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/2180009.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a1e099ef-ac5c-4af2-bb07-074c448090e3/bilemejelatufimutibikixu.pdf
    • https://uploads.strikinglycdn.com/files/8b3dc3c8-76fa-4f41-8f4c-4057a27e5a86/oracle_sql_dumps_for_certification_free_download.pdf
    • https://uploads.strikinglycdn.com/files/9269dec6-e1d9-434a-b53b-d3fe2bdbcc5b/bulisop.pdf
    • https://uploads.strikinglycdn.com/files/82e46890-5dc0-4a96-8be5-942a5724b0ba/77889810666.pdf
    • https://uploads.strikinglycdn.com/files/b226fef2-0d5e-4480-9341-05838f4fdaea/how_to_get_bios_password_for_hp.pdf
    • https://uploads.strikinglycdn.com/files/364e18f2-e618-40f1-953f-8f3791693bc6/11188937184.pdf
    • https://uploads.strikinglycdn.com/files/6a4f79a2-d116-41cc-be16-3851fa1acd83/adobe_premiere_pro_cc_2020_crack_reddit.pdf
    • https://uploads.strikinglycdn.com/files/19c2260b-4dee-4b4b-8568-d7b86f14f0f4/mcgraw_hill_answers_geometry.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f042.bin
0c1eee41d5d932bd500790439620e46d964756c7868d53f5df5d1c0a69dddb51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 5488 bytes
font_01_sfnt_off000102d9.bin
e547c0b144f44968f1359a47ad28011b703b7db90aff4bda19e245fa8923c2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10604 bytes