Malicious PDF — malware analysis report

Static analysis result for SHA-256 147c0e2716fb012c…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 19:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0415a512212ca642d36f55abec41b239 SHA-1: 15bee708f09329ff46dc5b6c249a874037d55504 SHA-256: 147c0e2716fb012ca6d57f73ce276652e7d57eeb03b41146918cbe33614049b6
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/award?keyword=basic+english+for+computing+student+s+book+pdf PDF link annotation
    • https://cdn.sqhk.co/leporolino/cibVCgc/jumperoo_space_saver_age.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/ijiEhi6/candy_crush_soda_saga_level_1882.pdfIn PDF document text
    • https://tulopesonu.weebly.com/uploads/1/3/5/3/135318186/97fc9d.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/qYhcejf/26677372300.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/bOr2thb/air_fighter_games_apk.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/rifos.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/5045958.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/tecnicas_de_dibujo_arquitectonico.pdfIn PDF document text
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/351204.pdfIn PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/tawodiwawulusaweju.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/82550760561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_6f6745959d9e45c8ba2745c288632b2e.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/is_drinking_chai_tea_bad_for_you.pdfIn PDF document text
    • http://totiwofosu.epizy.com/leveling_guide_wow_classic_warlock.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_14c24c86572c469eae12a6c3191c7062.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_ca9741f027904ba49dc5be96c71a7ece.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajujiju/buniruw.pdfIn PDF document text
    • http://nukamepewavux.epizy.com/duke_men_s_basketball_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/bazelafeten.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_47e973b7fa2347d3af221983eeb2fa46.pdf?index=trueIn PDF document text
    • http://notavopanugatog.epizy.com/battlefield_3_games_free.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_932f0ca5df7e407bad3e9f9dda2b24dc.pdf?index=trueIn PDF document text
    • http://suniwuvujibo.epizy.com/the_distributive_property_worksheet_answers_milliken_publishing.pdfIn PDF document text
    • http://xemubekimivimed.epizy.com/guwavibonoson.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5820 bytes
SHA-256: ad06b768b98aff3c447bd1f13f5ded6d456d97898c6e34f94f620d2ea4c9d70f
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10708 bytes
SHA-256: 1dd3f74f457328455dcafa52dccfe437045e7910866ea2de75930938a1a3f61f