Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ef5adcc873410…

MALICIOUS

PDF

86.4 KB Created: 2021-03-15 20:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8e3055143cbc8d06b472d6d4b3ae80f7 SHA-1: a1220ff6ebb16686705c8346d32e2f4335214915 SHA-256: 438ef5adcc873410bab5bbb02ff936e3e70cd006268ad9ac4e5895f192ca068b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to furnace longevity, directing users to external URLs like 'https://baarspo.ru/strik?utm_term=how+long+do+bryant+furnaces+last'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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/strik?utm_term=how+long+do+bryant+furnaces+last PDF link annotation
    • http://viteroludobano.mypressonline.com/nkjv_thinline_reference_bible_large_print_premium_goatskin_leather.pdfIn PDF document text
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/gusivejad.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/17160053015.pdfIn PDF document text
    • https://vazozedirasamib.weebly.com/uploads/1/3/4/0/134013018/51e07cc3.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/2567676.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/4113488.pdfIn PDF document text
    • http://wemokeledezo.iblogger.org/dedizoxojup.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/equilibrium_constant_table.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/d55218a0c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_0af05349f22347c1b0f2c05230051c21.pdf?index=trueIn PDF document text
    • http://povalimokuwov.rf.gd/broadcasting_definition.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/raymond_carver_quotes_on_writing.pdfIn PDF document text
    • http://romakilax.myartsonline.com/85451329889.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_088660cee8ac4e42b208384045227e98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/cash_count_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/kamogixilegidelisum.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_8a580151c90d4612978c6ce0d109a20b.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_d3d8db23529449c59ef25aea7dbe77f7.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_b25ac2f0c27a4943ad8c1f0f25296a35.pdf?index=trueIn PDF document text
    • http://vujexufekazama.rf.gd/pride_and_prejudice_chapter_7-9_summary.pdfIn PDF document text
    • http://waxozex.epizy.com/charles_petzold_c._o._d._e.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_f0f3aabca5bd4cd7a424b855c7eea3ce.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_e4270ce7c88e47979c668b19b59f7a38.pdf?index=trueIn PDF document text
    • http://pekagotikoweguf.epizy.com/72299541620.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/yesterday_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/naruto_ultimate_ninja_impact_psp_apk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 5484 bytes
SHA-256: 9e7a6de157befa76227c5e0a69ade7a3203f6feff243473592aa5ae4fe8ecfa9
font_01_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 11648 bytes
SHA-256: e57b20ef42bab07162bd6cad93cb4b24fe711056f43d2ddc1472799db8722bbd