Malicious PDF — malware analysis report

Static analysis result for SHA-256 05afaf1322af6dbe…

MALICIOUS

PDF

78.1 KB Created: 2021-03-27 22:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2802d4b534b10559589b662b841dbdde SHA-1: c826e681182576e78f4596acaebaf78bc1cf0be9 SHA-256: 05afaf1322af6dbef316a8197dd66c5c3e1706ccff3dfae6903c09eadb62d617
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to multiple external URLs, including a suspicious domain 'xezojetit.ru'. The document's content appears to be a lure, disguised as search results for 'abstract data type java pdf', to encourage clicks on these malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://xezojetit.ru/award?keyword=abstract+data+type+java+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390069/normal_60142cebd1f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5fe629e90f767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_604679e27fb1d.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/sofat.pdfIn PDF document text
    • https://tuzuxomewe.weebly.com/uploads/1/3/4/5/134527180/8247749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_6040624d8a55e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5fce79010a721.pdfIn PDF document text
    • http://blockhcain.host/free_fonts_online_copy_and_pasteb9nob.pdfIn PDF document text
    • http://7gusevshop.website/39527998109e0djp.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/kisaz.pdfIn PDF document text
    • https://kanunobak.weebly.com/uploads/1/3/1/0/131070574/7893384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_112e64204f534870b38205113466eac6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4b3853-7b73-46bc-ba2b-14020bf099f9/bosch_dishwasher_silence_plus_44_dba_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f894e15-41fa-4df6-b4b8-23dc5620aa2f/kiniwewil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be579b72-b4ae-40fa-80f7-5b681731a3e1/rofibotoxidilixesen.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_8d287bbfe67f43cbbf65a9405c94d9bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40008cb-d9a1-4ebf-9e03-bb718fedd7b0/gurodulozoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf2cb95-8d6e-46bd-bd77-175d47130ac8/rifaruxutixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad6021c-5cfe-471d-b96e-aaac5a612eea/47919577863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d925d91-fd1b-4996-96ef-13f492d41a23/good_credit_score_range_to_buy_a_house.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_2157d703112f4a6ca25c87720be5f1fa.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_a054950f799043e0a0914ddb489ecfdb.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_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 5484 bytes
SHA-256: 70aff693d1b8b0c5490839de82de102a92a3f00c0d76713b1ec2b0dc09758503
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 11748 bytes
SHA-256: a3b29b69d1e6ea30aed26ef33711c672319a47f17dbc46b178c74c3c9f93fd79