Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ca6d9757206fa8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 20:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44b8563b4a26c5c62ac67da0339923ab SHA-1: 42609781694d495adbfbe71211c5804f78f9d73e SHA-256: b7ca6d9757206fa82d80515ac4ee595b92f0564813093cbf7ba3d8713d3a39bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and embedded URLs strongly suggests the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://pistant.ru/uplcv?utm_term=how+to+block+numbers+on+samsung+galaxy+grand+prime PDF link annotation
    • http://tw-echen.com/uploads/files/202109040604502710.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/riwamulikosu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bivaxajuxoludodudajef.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/63092713327.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/60111460614.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/rusoxonulegomig.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/48370678470.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/34142896444.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/75321436808.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/98116138558.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/63381051377.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe992e9013---36470291727.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/46379793682.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/21885285039.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/4519737388.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901084549282.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kugemevodolod.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/81931755148.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210919_8D6DD3F2D5F41333.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/fezejufe.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/mafomasoxosepera.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wizakedosebusidoda.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/31794275951.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB277 16204 bytes
SHA-256: a6817b1ddb6c2d12fecf6bbbe989bf992d9c6dd8aaf83210c8dbb757471aaff8
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 11480 bytes
SHA-256: 2b7d19fb50f1e3770713c894218e20638aae9eea7dd935fef1cd9561da7f6ced
font_02_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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