Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c57bad05f2eef0…

MALICIOUS

PDF

74.4 KB Created: 2021-01-20 15:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e99eb18eaf35c02970576f0b669a4719 SHA-1: d52106fa08133a1f0844e822b6aedcd5926181a3 SHA-256: 97c57bad05f2eef0f34427dcdb9724020c8d6ea87316cb2c755dc6c27276638f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffnew.ru/123?utm_term=a+good+suramaritan+guide PDF link annotation
    • https://site-1176253.mozfiles.com/files/1176253/supermarket_vr_cardboard.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/fitawidajizibumoses.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/9f54483.pdfIn PDF document text
    • https://napopetonepew.weebly.com/uploads/1/3/1/1/131164038/jumon.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/pegapako_linitib.pdfIn PDF document text
    • https://site-1173692.mozfiles.com/files/1173692/moxinoso.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/9RCqrgg/fantasy_premier_league_gameweek_5_transfer_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/gU9Pibq/17888465636.pdfIn PDF document text
    • https://site-1172149.mozfiles.com/files/1172149/88195019962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fa732a264b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fe7c9bb87aaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f985115c12b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/lend_lease_group_annual_report_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/amumu_guide_mid.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/balanced_body_allegro_2_reformer.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/apsystems_yc600_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/91145444072.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/71308640946.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 5104 bytes
SHA-256: fe334560c6cfa00eca625ee1a5be846bca695d135553691a8538e4d88fc1a7be
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10752 bytes
SHA-256: 2d56abb29e538daa656208c413ee4dcb1116ab78023b1f9c355dc0947e3483e6

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