Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30ebd652af0075d…

MALICIOUS

PDF

89.5 KB Created: 2021-02-10 11:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 001eeccffde3ce0149467e85eef14304 SHA-1: 320b4e5e13b93c9f4d01be10e014f55d2669dfc0 SHA-256: b30ebd652af0075d853caa796599ae8b4d2afc9f44614f3d29fcbb828f7fef42
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF_SEO_LINK_FARM heuristic highlighting the suspicious nature of the embedded URLs. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wb?keyword=aroma%20diffuser%20user%20manual%20italiano PDF link annotation
    • https://bibuzutevokad.weebly.com/uploads/1/3/4/6/134634257/e6d0b58fbd643df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372737/normal_5fca341b6806f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fc7f33ff10a7.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/gubuwetalebot-vejavuwimusu-sefiligelafom.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/vudirase-kexapipetowujo-dujonikime.pdfIn PDF document text
    • http://kudorifet.22web.org/10_icse_email_writing_format.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/1319942.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/piwafovawuzofubaboro.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/e846d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_6006af4ada1a0.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/a4_label_sheet_sizes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/the_bent_twig_isaiah_berlin.pdfIn PDF document text
    • http://nunusama.rf.gd/50935922385.pdfIn PDF document text
    • http://redotikami.rf.gd/vcruntime140._dll_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/51060263490.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/attached_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 7448 bytes
SHA-256: cee456fe2742f2f070085687bc7ddcd367bc081692238841237b91dc9922f6b9
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 5040 bytes
SHA-256: 3363b9b0800542939864f4e2bdb4c1b42747614edada96ebcc462963c714a60c
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 11396 bytes
SHA-256: 87e96c0ecb39b09617c3805f90de5abf0cb73b8dd0081a19b8e05728be837476
font_03_sfnt_off0001432d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432D 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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