Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8acab42f2a8d5b8…

MALICIOUS

PDF

81.2 KB Created: 2021-06-07 12:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 67518865173bbeb04ddf3062d9a9e5d6 SHA-1: 23d3577e4ba656ff88a2bbc4a36c9b9f5a42a202 SHA-256: e8acab42f2a8d5b870c6d8550d4f1e2adb36aac2967d2064b8a1f7d511c398e6
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting numerous external links under the guise of popular search queries. The primary malicious URL identified is https://nomylo.ru/pbw, which is likely used to redirect users to further malicious content or downloads. The presence of a large number of external links on disposable hosting, combined with the ML classifier and ClamAV detection, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nomylo.ru/pbw?utm_term=yvonne+chaka+chaka+umqombothi+mp3+download+fakaza PDF link annotation
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/9252587.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/nugalolotamamobi.pdfIn PDF document text
    • https://penatiwateli.weebly.com/uploads/1/3/4/6/134617533/d2c377670b3d97c.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/zefejowet.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/f7d73db5.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/zirowofubopelopawog.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/dutoroxofoluk-milunuvinugimu.pdfIn PDF document text
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/serural_gizolanuxefa_rekenalodasi_wedugan.pdfIn PDF document text
    • https://sirofutalaga.weebly.com/uploads/1/3/4/7/134706343/4fd4a5.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://numefen.pbworks.com/w/file/fetch/144639099/66926603750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714dd936-d721-49a3-93a5-66b4d9ca9a55/54795741131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8cc2b0-ee55-4e91-8270-464fe9422b9f/the_chronicles_of_narnia_the_magicians_nephew_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb768473-d8ba-4867-acb5-e05b61fa91e4/how_to_insert_a_polaroid_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c4c4a4-591c-47b9-8535-e8f2ae42c5d7/drum_pad_machine_beat_maker_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccaff88-8a4b-46a8-9109-7fab13f1ca4c/vk_cartoon_cat_models_dc2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1274a388-8d24-486e-80c7-dab527bc2624/samsung_xpress_c460w_toner_media_markt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05699ee9-12d7-48ec-82ba-8f80f75523ec/kawasaki_fx730v_engine_oil_type.pdfIn PDF document text
    • http://raravisu.pbworks.com/f/84214193578.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/f/rujosategevasekerax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a156599-8d9d-440a-9628-c0bd6e2f9ea5/masamudowuludajenixizuzu.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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 5660 bytes
SHA-256: 4c277069b2de52954e6f3c6d60d4decb8b045afad02f323a6f3a9f1a76eef480
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 10712 bytes
SHA-256: c4e6a23d32ac7e09ddd1a8b639667899d5870f21e64d1f9e17728b1dfea2ced9
font_02_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e