Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6122e0e7cbd55d…

MALICIOUS

PDF

78.0 KB Created: 2021-03-29 09:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4a8289165ce0c033aea0235f71a8bad7 SHA-1: aad8fb5678337b78caedcab45d9447514d61f4ef SHA-256: 3f6122e0e7cbd55d6add04a2f673e9057b70454d54f74cd59df9108fcc986ef2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/award?keyword=calidad+total+en+educacion+pdf PDF link annotation
    • http://kutometez.iblogger.org/makikugudeposevar.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jVugjii/27517922858.pdfIn PDF document text
    • http://nikecortez.net/40904995798vr09n.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/1084404.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/zirukugabapasafeso.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/bgdxjdD/anime_maker_app_ios.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/rogugexarexat.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/4040421.pdfIn PDF document text
    • http://conicppjry.bid/women_under_stalinodppq.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/tjjjgFR/417776208.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/onn_wireless_keyboard_connectqlhuk.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/migosumirodu-damumozazenutu-gitasosopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4322ef9c-5849-4876-8474-b423143221c0/ilive_sound_bar_manual_itb066b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0e1123-c64d-473e-a071-50fefe1e321e/free_printable_2nd_grade_math_word_problems_worksheets.pdfIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_af74da57cc634ee0a99325eadfbc0593.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee18c565-4954-4321-8ee6-82af2aa3520a/73278386320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a9ffc1-c033-41f2-a104-52af73671fd9/wozajazulobufafotefuluk.pdfIn PDF document text
    • http://riberudedanute.epizy.com/cashing_in_on_the_american_dream_how_to_retire_at_35_epub.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_0503d6771a0049b6ae98bcddee24b796.pdf?index=trueIn PDF document text
    • http://durunorutap.epizy.com/best_website_to_marathi_movies_free.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_36f1bcdce8ef4a81bf6fd23b1f72b4e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16817f7-2f48-4227-a3a9-c7b90e9dafba/how_to_setup_a_zyxel_router.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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 4780 bytes
SHA-256: 3a6ef87051fb59dbb7b3f26e2ce0843e5ab7f2b21f9166ace668092a8ff74931
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 12156 bytes
SHA-256: 5945e99467067581d2f4f83756eb64612709b0b2f20b2c786f1c7754de8de580