Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a05cc36415a529…

MALICIOUS

PDF

77.1 KB Created: 2021-06-09 14:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1208cc6e90878cf1274ddfcc36ccaae9 SHA-1: 6caae5e2e6580df4b003a985168b1d91217ef85c SHA-256: 16a05cc36415a5299007a689c843ad220966a2c124624abb1d232b3a596c6d0d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('maypoin.ru') that is flagged as a link farm on disposable hosting. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the heuristic firings strongly indicate malicious intent related to URL redirection and potentially obfuscated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maypoin.ru/123?utm_term=aboriginal+art+animals+templates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379969/normal_60c090babf076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_605ab35ce8e19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476148/normal_6055f311f1df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_5fda6e05b587f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6039dc8953b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_600a65d553921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_6045e35f76f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_604e2bf52089b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144664662/hp_probook_450_g5_drivers_windows_8.1_64_bit.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144479058/27829838722.pdfIn PDF document text
    • http://jolamibo.pbworks.com/w/file/fetch/144651597/noxofexanuzagezoxojaza.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/87114448676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86e0886-5e17-43bd-8c05-3c7731e5e226/101_okey_ip_hilesi_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7aed26-e555-4823-b803-de5b3f9d84cf/wowumab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85c10c1-b8f4-49a3-920a-97ed25fdf191/zikedijudir.pdfIn PDF document text
    • http://raxonepem.pbworks.com/f/85078618968.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/87266095607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5c05c0-588a-4e38-9cac-2a59847161ef/moonbyul_eclipse_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff59f9f-15e0-44a6-9af1-7d514589f706/dotijogu.pdfIn PDF document text
    • http://tefesabiji.pbworks.com/f/raxunizukobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917a24b5-7200-426f-884d-f8e03856611b/nasujiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452708d1-2760-4ec6-abcb-04635bbac23c/fifty_shades_of_darker_soundtrack_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba99cdb8-10b2-4839-a95f-4017fe71d19c/bekiseforamekuxi.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144833166/belijegawilepovixon.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/jevebikukaxavara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf076b1d-7e7c-4674-bdd0-14c6fd851b66/dijifu.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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5268 bytes
SHA-256: ae3d367f8cadfef3ead0adc674f1406dbdd5198ef4fc26ce65ccb060d8ca4dab
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 9764 bytes
SHA-256: 652df9bc041f7185fc7b42da127a515ccba9094d766b1d52b528805830924670