Malicious PDF — malware analysis report

Static analysis result for SHA-256 43279a45a311647d…

MALICIOUS

PDF

72.8 KB Created: 2021-03-25 18:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 111297232f2380961ce062ed096d5ad9 SHA-1: 8a39d9c6bffcf01945cc14a1d5b297f2527da565 SHA-256: 43279a45a311647d84361c928cbf1a34949218b598e4cc02725f8b99138f0973
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting and potentially malicious domains. The ML classifier strongly indicated maliciousness, and the PDF's structure suggests it's part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of external URIs and the link farm heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/wix?keyword=unblocked+strike+force+heroes+2+hacked PDF link annotation
    • http://jotipire.iblogger.org/kubibozawadixozar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_605c4b292b207.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/o_level_chemistry_notes_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/0AgjmtF/ice_scream_3_horror_neighborhood_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/Tjdhe14/83277062375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486042/normal_5ffe627249559.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/tl-wr841n_factory_reset.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tetizawoto.rf.gd/pearl_grandfather_clock_451-050h_manual.pdfIn PDF document text
    • http://nogogesusuwebob.epizy.com/sony_bdp-s3200_remote_app.pdfIn PDF document text
    • http://zutilokip.epizy.com/zivojigajejupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31a04a1-ce5f-4484-aca8-2f4f282d0eb9/what_is_the_best_indoor_bicycle_trainer.pdfIn PDF document text
    • http://memuwalarike.rf.gd/bosch_washing_machine_series_4_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72039853-30ff-42bb-a516-130b46d8f230/gedemozawagezap.pdfIn PDF document text
    • http://sijozorugepidu.epizy.com/55463879233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feea7afe-d1f5-4c75-89c4-0c5aded7098e/50704130217.pdfIn PDF document text
    • http://bisegigosos.epizy.com/58273317678.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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 5436 bytes
SHA-256: 4e0492c7789720a8d4f7a52cdb822bebcd23a654c823d98c0252f4954e2497bb
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 11296 bytes
SHA-256: 8cde25b8df2ebdc3aa2354032c35c02bb2dba604bacb39ca853ee7c0a097b5a5

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