Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec572926a6aa7de9…

MALICIOUS

PDF

96.7 KB Created: 2021-04-01 15:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bd77391eac5687d5ac870faae3abc41d SHA-1: 6fe6151ccdd2ab787c1cd99981154b6f7fbbee26 SHA-256: ec572926a6aa7de9ce0ba63831c97d7af2cc238f1cc5f8a54d34b703f1f36519
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains and hosted on services like Weebly and mypressonline.com, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/aws?utm_term=herman+miller+aeron+craigslist+texas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5fef024a50c93.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/gujejeseboxegof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_60652fa99ec84.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/vefutixor.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/monujivovopu.pdfIn PDF document text
    • https://kevelowomovozi.weebly.com/uploads/1/3/4/0/134012304/sovepivuvox.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/gyPL8HN/free_chinese_checkers_board_game_download.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/544841.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/minimalism_lifestyle.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/timetedid.pdfIn PDF document text
    • https://dinorega.weebly.com/uploads/1/3/3/9/133999175/82e1b.pdfIn PDF document text
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/5d26b1d130a6cce.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/76d301.pdfIn PDF document text
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/bisakadovalo.pdfIn PDF document text
    • https://rewagafiwexufot.weebly.com/uploads/1/3/1/8/131856649/7435099.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/2661178.pdfIn PDF document text
    • https://topukutenikoxi.weebly.com/uploads/1/3/4/6/134668920/ae4f0a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5fe297c769dbb.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/bhbhfhd/icing_recipe_for_gingerbread_man_cookies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_6029b6b7871b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giworutiw.myartsonline.com/astonishing_swordsmen_sorcerers_of_hyperborea_2e.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 5148 bytes
SHA-256: d3ab596688567eb15d62dbf10d29300dc4b6a3fcf0e106f7adf76e1271219b06
font_02_sfnt_off0001368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368D 11636 bytes
SHA-256: a86cbe535e0b160fba13bddb981d2ab0d9f949477e2e2f9e4ca7418b66a35a14
font_03_sfnt_off00015e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E64 16600 bytes
SHA-256: 01cbbb36ce3b89d287d337138f801827a89b98a7e1ac2537db9a5b8da33d645c

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