Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca1d13eb7ddcc5…

MALICIOUS

PDF

77.9 KB Created: 2021-05-03 23:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de352e4a4b15ee7567d1f5f915c53acf SHA-1: 166d1a3de3f9eae90fa303e9a15d4cd066979017 SHA-256: acca1d13eb7ddcc549dfd7e83bed661cdf95e88eae99c005daa8aad83dd14c72
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=how+much+do+autozone+pay+managers+make PDF link annotation
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/jimalasaboliloki.pdfIn PDF document text
    • https://vevabute.weebly.com/uploads/1/3/4/2/134265428/fakupu_dutokiwixules_tibesasuz.pdfIn PDF document text
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/wedesubo.pdfIn PDF document text
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/c301bfefb824f4b.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/fuxopen.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/zifibefined.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaniwemikadas.rf.gd/bass_i_love_u_song.pdfIn PDF document text
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_0fb55cb20ca7474cb74435a3d9aab4c5.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_ce1db4f402f849d6939025fc2758d57b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/6609827065.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_8c3a4a3468264373abf87d90094a28c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/96789838496.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_724b86a11369465db7ea56f058efff0f.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_d3bae7f1ef974fffae3fbb2f4a38969c.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_7247a0b2a3b54bf3a320d2faaeeed622.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b35596c2fe724782bc7e2324a1e9d2aa.pdf?index=trueIn PDF document text
    • http://zepurudevivo.rf.gd/88870625499.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_33efb221ae1245dea231f2b8d8ee55da.pdf?index=trueIn PDF document text
    • http://bitugoxopezuwu.rf.gd/material_safety_data_sheet_lysol_disinfecting_wipes.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/66214282476.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/lajutanajokivowakazurudem.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_71cdde2d277f4b0e86623d34bae34d0f.pdf?index=trueIn PDF document text
    • http://semomudunetowa.rf.gd/billing_system_thesis.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bojivi.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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 5724 bytes
SHA-256: c7c3a149fdf61887b9c4e950120bdecc3d48a6b8b8372a004dfc07809ecc60a5
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11060 bytes
SHA-256: a1b24b380fd39e64f959bc525755ba583305787903cff91ad8a4575abe2f28b9