Malicious PDF — malware analysis report

Static analysis result for SHA-256 d676b8ce8315be9a…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 20:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038283b50cff208ab26aee620c6ce975 SHA-1: 28f5c1441de959844c3b7b4a5e7985a2344b2bc7 SHA-256: d676b8ce8315be9a95e21b968aee9b411c8dd7e3034709fcafc4af89ff19ef7b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports the intent to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure suggests a SEO spam or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • 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.
  • 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://resalured.ru/wix?keyword=glencoe+pre+algebra+pdf
    • https://fuzidofan.weebly.com/uploads/1/3/2/6/132695445/jujarixodagiw.pdf
    • https://sazofezobixana.weebly.com/uploads/1/3/4/5/134524546/9590198e.pdf
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/cdac40b6acc553b.pdf
    • http://lunatan.medianewsonline.com/functional_analysis_psychology_example.pdf
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/1568f8c20.pdf
    • https://lovizedisar.weebly.com/uploads/1/3/1/4/131437361/vatotevepimigo.pdf
    • https://pebewaviwukak.weebly.com/uploads/1/3/4/4/134463457/5834550.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/lelopigadevonav.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/tatifekutakasusafu.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/xewonav_maseti.pdf
    • http://zexaribamemavi.sportsontheweb.net/lurofej.pdf
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/3299989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_7c3492bcd90f4200a9bb350f2f3b8741.pdf?index=true
    • http://xekazaz.myartsonline.com/98989331647.pdf
    • https://uploads.strikinglycdn.com/files/7a70a608-69be-4102-bab6-1afa71377e06/27348248186.pdf
    • https://uploads.strikinglycdn.com/files/6b5ce1ab-6e9b-48a7-b460-ec2b4a2ecfb6/how_to_clean_the_utensils_tools_equipment_and_workplace.pdf
    • https://uploads.strikinglycdn.com/files/d3c81537-02b9-4240-960b-9a08f0db2a17/diccionario_espaol-italiano_larousse.pdf
    • https://uploads.strikinglycdn.com/files/93709022-46c9-42d4-a41d-a827683cb29a/73246324064.pdf
    • https://uploads.strikinglycdn.com/files/72188045-2f80-4a22-ba4e-a160c50054b5/98347317531.pdf
    • https://s3.amazonaws.com/lofese/games_for_windows_live_8._1.pdf
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_de4c9bf10c5f4030ba3d380cd771f391.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_0208c9a60c824ffd8f1540330e04e184.pdf?index=true
    • https://s3.amazonaws.com/gedexim/hal_varian_intermediate_microeconomics_a_modern_approach_8th_edition.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_06c0c41556d9439c993ace129ec31d16.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_686b0686b227454f84f0f4d45307adb6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d938.bin
72c75c9fd40ee81990da5a7129888a881ca80f6f2d174f4fd05753c45a1db8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 4976 bytes
font_01_sfnt_off0000ea22.bin
222b17136fe49a0f0c607c12fc77cef232696197ddd41e0b19dd8bd3358c0e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10304 bytes
font_02_sfnt_off00010ce1.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 4324 bytes

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