Malicious PDF — malware analysis report

Static analysis result for SHA-256 d978589755f3a90a…

MALICIOUS

PDF

76.8 KB Created: 2021-05-05 00:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2c01791bb39dc02c07fab7d10a9d28ae SHA-1: bf0da925be78f284c0c1ebb2640b6b9419ed1fdb SHA-256: d978589755f3a90aa5068fa87676dd26a8d31ae7263d11c6235be04aa7973e36
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's part of a campaign to drive traffic to potentially malicious sites or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/strik?utm_term=sony+rx10+mark+iv+accessories PDF link annotation
    • https://wiwetiforezopiv.weebly.com/uploads/1/3/2/6/132695432/wikuvasikujapapof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_6066a0741c435.pdfIn PDF document text
    • https://nibadaxolakawub.weebly.com/uploads/1/3/4/8/134882114/fexodakume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fde4a144e971.pdfIn PDF document text
    • http://genusadnlo.space/wovambn31w.pdfIn PDF document text
    • https://todijedesat.weebly.com/uploads/1/3/4/7/134775475/6677729.pdfIn PDF document text
    • http://aycotoro6.xyz/vuxuxugumadjgei.pdfIn PDF document text
    • http://tuimag.ru/gutakuzibisidatomef3wk7.pdfIn PDF document text
    • http://nesobaka3.xyz/bozojoxinefigabofalasosohz5i6.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/c530954e-586e-45e6-a351-8e5dd78fb16d/39588199839.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_dd75882b0ada449a8a1b4dc247da9f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b093e858-2ea8-47f3-a436-debc52971eae/the_hobbit_full_movie_download_720p_dual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1167c4e9-21b5-4789-8442-87c81299e8cf/norcold_n8x_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd58ff89-bdc0-4ed3-9536-94ef9b042ab4/lisov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c193babe-7ccf-4039-9fc9-639e9c87c118/90015680528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5dba1a0-98c6-4a25-aac8-9d0cad74544c/what_is_the_difference_between_global_developmental_delay_and_intellectual_disability.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_b0954e918a754830a6466bc4ff3f2669.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a508dca-cbb5-4dd0-b9d2-e5d38c9d3d8a/where_do_wild_dogs_live_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd80f02-90ca-4f4d-8131-9dc2c7046fa7/3697755627.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5504 bytes
SHA-256: 571c314164e9960f90ce04a3b0f32231fa795c77725d2d9220782768a8b6f4cc
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10548 bytes
SHA-256: 4b3e3b83b86fd7bc720e8bef349e17d448cc19a8766b897565e74c91816e423f

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