Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4cc8ac4e6e118e…

MALICIOUS

PDF

95.5 KB Created: 2021-03-29 00:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ef5f87d0ee8b0c971d366e30e9e12055 SHA-1: 1129af80fc50f5f2e9ddd71f2ae6f43ae50a5af6 SHA-256: ab4cc8ac4e6e118eeaa35c8ffc646b93a710d89fbae7d53aed55bff2b207e6e4
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded links pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, suggesting a phishing or redirection attempt. No scripts were extracted, but the sheer volume of suspicious URLs indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=char+griller+smoker+manual PDF link annotation
    • http://geniputan.66ghz.com/western_blotting_methods_and_protocols.pdfIn PDF document text
    • http://lavawogufiwilor.iblogger.org/jozamipubibifuguxa.pdfIn PDF document text
    • http://xifemimuxudita.22web.org/fut_19_serie_a_squad_guide.pdfIn PDF document text
    • http://cethq.xyz/63460816129wi9p2.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/7005871.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/ihjhiic/20620174040.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/zY9jjhd/apes_movie_2018.pdfIn PDF document text
    • http://mnclassis.org/how_to_fix_danby_dehumidifieruho54.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/ff7a0a2efe85b.pdfIn PDF document text
    • https://cdn.sqhk.co/lepezusija/hhjjc7v/miss_world_2017_question_and_answer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magomodatibotu.epizy.com/kapurulisebovutifag.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_4f86b5245198413dba50716f243bcd6c.pdf?index=trueIn PDF document text
    • http://tesusaruva.epizy.com/metformin_causes_bubbles_in_urine.pdfIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_32e16d54875e43019a556b540e5e9393.pdf?index=trueIn PDF document text
    • http://bomofafavadu.rf.gd/54422962850.pdfIn PDF document text
    • http://lojosikol.epizy.com/66704577808.pdfIn PDF document text
    • http://zekumom.epizy.com/56567782064.pdfIn PDF document text
    • http://kanalase.epizy.com/zf_transmission_fluid_alternative.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_6fcac39fa67a4287b17e138eaf67d4d6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 5068 bytes
SHA-256: ee8b06150cd15e3ed30e13475f4b13249cb3030c28c3cfa2339b2a82bc0d93f8
font_01_sfnt_off00013cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBA 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0001454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454A 12216 bytes
SHA-256: ccd91f4f0da90a44b3cb320819f3a02651b8e78126ff3a7aedd80ffe627c51a1

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