Malicious PDF — malware analysis report

Static analysis result for SHA-256 535b0ff7f1094fd8…

MALICIOUS

PDF

83.3 KB Created: 2021-03-10 00:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4740be06cb5b0008d295d8dbae54a811 SHA-1: d0ed7ca7e60b47b87e5d994dd94e1518a169c570 SHA-256: 535b0ff7f1094fd8fd72159bc51a853aa17438ab9eea162504f172c18ceae3fe
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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.
  • 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://pelibifir.ru/123?utm_term=batman+dark+knight+rises+theme+song PDF link annotation
    • http://yoga-fitness.space/8d_problem_solving_technique3prqn.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/pIjdShb/jungle_heat_mod_apk.pdfIn PDF document text
    • http://zeropium.com/admin_template_vue_laravelrswtm.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/jgvRieB/xutopipuxejakonomobora.pdfIn PDF document text
    • http://pornbustyvids.com/fesafatupidikapizu1s2l3.pdfIn PDF document text
    • http://usblighter24.site/36596438851nmx2.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/iVlhahj/tawix.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/jYgh3M5/dofal.pdfIn PDF document text
    • http://numberoone.xyz/bipelunitufivobadudux9zdrw.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/hahdMif/average_cost_to_build_a_house_in_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_c27c68dc7b56431b88c9819f3ebe1cbe.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_5d8f29a022e145fd816436d6948ec1f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8a1e92-84d6-49c5-a350-61bcc1078c55/what_are_pituitary_gland_disorders.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_832106d261454aa5a251e7afc1829f5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c768d1-b234-49df-a772-bdf4593a1098/casio_exilim_ex_s2_charger.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_e779fc60351b4c4a8801c58cf157a8cd.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_f84ddeff35f14109bb7de6b276e67965.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_5764452424d745dc93911c727108f7cb.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_1f0b11a24573440eb2502ed748bf2aae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ec4d57-b777-45d0-ac05-35ea497ea5ae/psychological_tests_for_anxiety_and_depression.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_520344e964914aae88db71332189423b.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_76ae6daadca1444ba84c90d459bffd78.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_f98825fc4ad34c8abf8abbb3a6388ab9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f6fc8f-13e3-4a63-9c21-073ec395cca9/78402217458.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_1664c39dc50b4823866d19eababd5af5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86ef5f4-8c99-47e4-bced-13c81a0715db/assessment_commentary_edtpa_early_childhood_sample.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_65f1e4429ecb4a8bb2c65729bb4d0219.pdf?index=trueIn 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_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 5320 bytes
SHA-256: 77a7b43d5645085db403c39436107002f926230bc90f63625e637fd07ffed992
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 11544 bytes
SHA-256: c7598c8b13597196f0df42a6bd495dd402831360fa2f7e8d4ab03e7881a5c7ea