Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf3b4e8872c841c…

MALICIOUS

PDF

91.9 KB Created: 2021-04-06 11:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 79d7ccb69e24e5069d5325a9c0508b5d SHA-1: ebbaab6d4b74a7cd65c218ca81fa4b2dbf9a9304 SHA-256: bdf3b4e8872c841c6a7e33dfdec61aeb95063f76c9ee6e5b10d0153362653bad
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/123?utm_term=oxford+dictionary+full+apk PDF link annotation
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/xiletofesonulisixi.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/javumixiweki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_603de56b645db.pdfIn PDF document text
    • https://kezarixanutoge.weebly.com/uploads/1/3/4/3/134372428/870459426e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fd26cb61dccf.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/kuloturepufu_tagezun.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/dgjhfja/dizakivivapuvuxeremopufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_60558b3609c90.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/5230251.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/download_kamus_bahasa_jawa_kuno.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/960864335.pdfIn PDF document text
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/gagokutapo.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/NYjeu3s/73639463466.pdfIn PDF document text
    • https://xugeragerowet.weebly.com/uploads/1/3/4/6/134641260/kemibol-jevolixut.pdfIn PDF document text
    • https://rekizutor.weebly.com/uploads/1/3/0/9/130969391/4d3275cfb3433bb.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/jjjgIjj/ikea_malaysia_catalogue_2019.pdfIn PDF document text
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/fubafim.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/FgfYjd4/81792830582.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ibDjgc4/tiki_taka_ti_dog.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/donapitelaj_fipawomakija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kawerulim.onlinewebshop.net/63320127466.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/tukonajabivixaj.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_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 13820 bytes
SHA-256: ec1d284719a59404bcae14a2eade60c4ce261821b5d1a919c4d7be0840d5dc7c
font_01_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 5232 bytes
SHA-256: 02e0aec2044272d82967ffed1bd74cd909d364adfeaadd12e0dbe517573985ca
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 11920 bytes
SHA-256: 52173d71af69e998b646e61c41f94fa85e5bc58ef829cb2e71a8e59a4e7b005e