Malicious PDF — malware analysis report

Static analysis result for SHA-256 890492a79571fa18…

MALICIOUS

PDF

52.3 KB Created: 2020-10-28 00:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4645ff377d1fc10e6e996e1b4762fbe4 SHA-1: 1af1fc62f4bb576233e7e60991067cfc72455f4b SHA-256: 890492a79571fa183780ebacfbb42d5c2dffef31fc811039c6c301f3c40ab77a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The document body, though partially corrupted, includes text related to 'characteristics of minimalism in literature' and URLs, suggesting a lure to phishing or malware distribution sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://gettraff.ru/strik?keyword=characteristics+of+minimalism+in+literature In PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/0e43567fe649.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/kubalavemu.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/tefedapa_lonupe.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/1376160.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/sipaviwo-kesotaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f9475ddb8f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f93c2d89849e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/glacier_hills_elementary_eagan_mn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1532/5861/files/54145986764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/angles_of_elevation_and_depression_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1260/6110/files/buxafebib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d205378a-3a08-4bb4-8ea3-187aaade1395/new_holland_model_451_sickle_bar_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93267c16-664b-43ae-982c-4d5c002c5d2a/tikuxiwewizagosisitapena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993c98dd-6846-47a7-9598-820b9e87369e/19439576370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4339fab1-d5ab-46a6-a92c-18ab56df3eee/kafik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cadd96-b201-4125-951f-cb6ce9ef914a/tidisut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ef4745-3f07-42d2-bb42-ed79d42133e6/givapebedojizizak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252f7605-a0e4-42df-a58b-a27737b5f303/vikamemeginonuwag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7140/1891/files/46023414097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8982/5443/files/welcome_letter_to_parents_from_teacher_distance_learning.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_off00008d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8F 5024 bytes
SHA-256: de0434b0139602420f078e52ff04900cfc508f28c9f9500ec2703dbea8e1eea4
font_01_sfnt_off00009e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7B 10816 bytes
SHA-256: 72c935b17d7d1bf1abadd8da5f16e1fbc15042682d82b27a7d566c7687d57706

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