Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e80b562288252db…

MALICIOUS

PDF

70.5 KB Created: 2021-04-18 04:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1ea642a1432d5d37ecc06d438be6fb2 SHA-1: df5713d89202958aa74ccbaaf8648e92a6979bbf SHA-256: 5e80b562288252db83fe6a48cfd5def9dd8e07bc616b67f43144b1fd1c2da475
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-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://dugedepap.ru/strik?utm_term=tin+tin+chinese+restaurant+wilkes+barre+pa PDF link annotation
    • https://cdn.sqhk.co/balapakufogo/hjI7avk/90835618769.pdfIn PDF document text
    • https://cdn.sqhk.co/dizirajeb/gehgIif/84079855887.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/ghjiuTB/61728351132.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/giafijd/exoskeleton_examples_of_animals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_690cd86f53974d1b8b5439839d8a8e1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7199d8a-1b32-4038-8eb3-b429305c237c/wuwefimosunopawosul.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_4d608ae0650b49d4984b0de91bac6435.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9486c6-01cc-4a78-a14d-54ef4ae6f131/safuwapiwutumesafejukoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04baf29-70d8-4083-b8b5-8cbbed138530/what_is_boundary_conditions.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_44fdfa37c037425a9a0ff1111deb792d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/297f52d3-5e27-49f1-b1d3-527ab4167408/17886096320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46aaec2-c477-4bab-9c12-be3da2b2daa8/dunewek.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_d9556f9a61ef45fb8d69c188077632d5.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_8f2eb6dfaf5846f189cb036f5aaea102.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_1c014e61927d43d2a6f7988ce2e859e3.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_1c6e086d298848dd92954d715102d72a.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_de2172c3b52a4556aa6ee5882aaa4f56.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_ad9bbe16070d402087d637595c8bef7d.pdf?index=trueIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_8e6ecce5d67149e59b03b7d00a5cebc7.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_64097ea195224beeacff3173bbb52d34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f07d62-8438-4f6d-8a59-27f9d21f89f6/77939160517.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_02d7755f1c2142bfab28efbf46a0b603.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f169330f-83e5-4b0f-82fd-b4086ed7c174/why_wont_my_hp_officejet_6700_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7232e916-3da1-4512-b662-c4d3dc8ae6c3/what_to_invest_in_2021.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_aff555472b0b44febd153a4170d87e92.pdf?index=trueIn 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_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 5268 bytes
SHA-256: a19e18eba0cd65998562f4e327e2fb5931ea994c74787e38e32d0cd349855d35
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 10868 bytes
SHA-256: ac0adf8f01e3adfdd42cfae1ce17a243a04c86532fd5917e12c7c7d7e8b4fe9d