Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb91692d47440fe…

MALICIOUS

PDF

82.0 KB Created: 2021-03-04 22:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9a8d0169f418bc34b8b717077d90f982 SHA-1: d12e3113a07d3a9956ae7fce878d2c5aac180e9c SHA-256: aeb91692d47440fea8278c5ec66ce4baca36da1317f07861f2241c7072586e90
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with heuristics indicating a link farm designed for SEO manipulation. The document body, though partially corrupted, suggests a lure related to 'Army pay chart 2021 reserve'. The presence of numerous external links, including those hosted on disposable domains, points towards a malicious intent to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=army+pay+chart+2021+reserve PDF link annotation
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/tofodutunotedudifix.pdfIn PDF document text
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/tibof-jodapumumax.pdfIn PDF document text
    • http://bagururidafu.22web.org/what_is_the_point_of_learning_social_studies.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/ijehigf/fiwuduzipabogakebi.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/hbUjdhf/legends_of_runeterra_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/xiijfhh/jajopizelevuwig.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/9335803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://webukoxaxox.rf.gd/logo_quiz_expert_level_3_answers.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_089a0f7a23b84a3cb50eae972c9c9733.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_a10092c1663d42888b9c516e1a851845.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa29a448-b8b7-4e31-a166-a07f1c41daf2/gone_with_the_wind_book_main_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63eda47f-8d5c-4e23-9fc7-f91c6782af61/does_price_action_trading_really_work.pdfIn PDF document text
    • http://zerokafejedumij.rf.gd/los_angeles_chargers_injury_report_week_15.pdfIn PDF document text
    • http://loxezenot.epizy.com/ms_excel_formulas_with_examples_free_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5b011a-5aa7-4401-b11b-5a5d48d82938/how_to_install_nuance_dragon_naturallyspeaking_13.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_12e6430604bc4fdfa28105d527ec4b74.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_fb0837a92243442595cdfb5540b72f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cfd34b-87c2-460b-9a41-dc3b61ba5fd8/what_birth_sign_is_compatible_with_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f52d96-a0c0-4ad9-9ce7-5c205f487b51/singer_4423_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3d2d01-6efd-4425-9423-25c5c744fdc7/nortel_feature_codes_call_forward.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_678a76761eee465e881943eee64e3d03.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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 5140 bytes
SHA-256: dd2e5315428c11c09e2414083a9d59c5943eaf330a34061c106961eb17cb7cc8
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10916 bytes
SHA-256: 097994b2643bcf9097f35f977d84a9962fb5dee0b9e98b10aebae270c73e1a13
font_02_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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