Malicious PDF — malware analysis report

Static analysis result for SHA-256 a691eb1782f135ab…

MALICIOUS

PDF

77.8 KB Created: 2021-05-21 21:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1bd71e714ae4bc3846265fdb90bd0b55 SHA-1: 840a9d017f5e31444d615437c1e79269f2be8412 SHA-256: a691eb1782f135ab379985a962d4e722123465aec3bb72d74ceda0535d2f748d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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=el+ser+uno+audiolibros+cosmo+alma In PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/lalugaj.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/vifenenil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_6055f822dd98e.pdfIn PDF document text
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/2915896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5fe66bdf385d2.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/mixusu.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/5e63631b-8902-42a1-86eb-d60f0f8e4cb3/10471515966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b67de67-e006-40ef-b6ad-8e1921e62bd0/22804725891.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/year_of_the_pig_2021_predictions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4848180d-44a1-44b5-96d3-1619bbd95c51/what_can_you_make_with_a_flamethrower_in_little_alchemy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739b8ded-2b2a-4c27-a0b2-4eea4b770c1e/rijajivom.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/17878151011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5928b312-b629-4546-8d2e-7af7eeee0e49/rainbow_magic_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696403bc-9eb0-4934-b689-fff7f447d40a/53861958557.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/how_do_i_create_a_training_plan_on_garmin_connect.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/xudumoxekoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/bofefizazajivokores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f865d4-fbc1-4131-a0b3-93160221fd8a/junubewamesojigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb183cb8-2ce5-4282-b3e1-4ad0e0ad80f4/pekunemojivulut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e15f9d-24a2-484d-98b7-628d78f74a85/is_tesla_model_3_lease_a_good_deal.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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 5184 bytes
SHA-256: 5d7707805aab903f33900512e15956cb512f09e71e1bc6b152e2500b67d79808
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 12876 bytes
SHA-256: d3b93932767e5924661e44e5f90a2cd932dd36b2bbd05c66789dadacec24c835

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