Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b471381f3b566ed…

MALICIOUS

PDF

100.3 KB Created: 2021-04-17 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c06e30b725259cdc0c2c6ba2317438e SHA-1: 55e3065ff0b609fcec72179d25665fd0b3a4334b SHA-256: 5b471381f3b566edc40e4834cf74931951f69240a9f8c72c53781f1f2afdaa4f
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirectors and disposable hosting infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=surah+al+mulk+ayat+23+dan+artinya
    • https://cdn-cms.f-static.net/uploads/4498404/normal_603c2c11a59ac.pdf
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fec48e99a170.pdf
    • https://cdn-cms.f-static.net/uploads/4393779/normal_600ad9d141113.pdf
    • http://kittyplay.online/bissell_spot_clean_proheat_pet_cleanery6feb.pdf
    • https://cdn-cms.f-static.net/uploads/4422163/normal_606a5ed671904.pdf
    • http://zugapuvu.mywebcommunity.org/vilerufarupafewegekine.pdf
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5ffeb65823761.pdf
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fe15d2e2363a.pdf
    • http://kunepuvobimamin.medianewsonline.com/sexivetukuwerijo.pdf
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5fd92667585d7.pdf
    • https://cdn-cms.f-static.net/uploads/4457843/normal_6065a590a0a83.pdf
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf3e69ceafd.pdf
    • http://nikaold.site/safusowipinijorakizuxahzdbb.pdf
    • http://gexopidikimo.mygamesonline.org/nanulibabo.pdf
    • https://cdn-cms.f-static.net/uploads/4454671/normal_5fd9922e5f79e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34b7316e-c79e-4b14-b71f-810bd961d58b/how_much_auto_mechanics_make_a_year.pdf
    • https://uploads.strikinglycdn.com/files/5be22d62-32f5-45da-9f01-53b0e57e694c/pirojanusurujumevapaseme.pdf
    • http://fazaburifug.myartsonline.com/hp_officejet_pro_x576dw_multifunction_printer_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/7aca9b05-94f6-42de-bb92-00d0c9d41024/9189860266.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014b07.bin
5d92963ebcbf049df09cea820649e6c23ad7305754793fcadfe1f7e2082ea9c4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B07 31768 bytes
font_00_sfnt_off000114de.bin
208c2ce9a7d4f1e12e331e62e0a581b0c0839e594ec682e3bafcb3329f05f93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 5452 bytes
font_01_sfnt_off00012743.bin
5b48a1f29cba433e551cfff93fc0bc392a65018ed1e71de6d75cb33a405c11e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10400 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.