Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99c9f3684afbba9…

MALICIOUS

PDF

79.0 KB Created: 2021-04-14 03:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 13c9d3342b504c2896ac8fc8f72de000 SHA-1: 285e17c6b49737d34a7d1a087e347ca4c2aebf36 SHA-256: f99c9f3684afbba9bf26b773bea0975815f507a13c2e1ea43a8f1b9759eebe4e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('nipisod.ru' and 'gowanenutik.mypressonline.com'), suggesting a phishing or malware distribution attempt. The PDF structure and the presence of external URIs are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=how+to+analyse+data+from+survey+monkey PDF link annotation
    • http://gowanenutik.mypressonline.com/mariage_d_amour_sheet_music_piano.pdfIn PDF document text
    • http://leniwatojetojem.medianewsonline.com/cancer_pulmonar_epidemiologia.pdfIn PDF document text
    • https://zokatitolef.weebly.com/uploads/1/3/4/7/134702636/0c821.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdfIn PDF document text
    • https://mokovudome.weebly.com/uploads/1/3/4/5/134598928/2223a3.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/fomirovavibepilivol.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/bangla_book_class_11.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/goninitexibapakiradi.pdfIn PDF document text
    • http://dibopisol.iblogger.org/segalilabeduvowurokubapow.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://tebuwawezizafes.onlinewebshop.net/writing_a_news_article.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/dufikikelebukagezunebaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414aab82-9624-4ccc-8162-067ebb11b5b4/40026717184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b55e41-2121-4ddd-8b3e-f18ae415cea4/what_type_of_functions_have_asymptotes.pdfIn PDF document text
    • http://reditavipesef.rf.gd/five_nights_at_freddys_sl_apk_obb.pdfIn PDF document text
    • http://xakarukuneki.rf.gd/switch_case_c_example_program.pdfIn PDF document text
    • http://tuwobema.rf.gd/dibidodoxitixavak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f375d3-7e9a-4fdd-8358-ea18ba6d9849/4334635483.pdfIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/4604890279.pdfIn PDF document text
    • http://kuwexugebukutim.rf.gd/capitalization_worksheets_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9892c436-ccc0-4794-8f97-0fdf6bef4bc2/whirlpool_cabrio_he_washer_unbalanced_load_problem.pdfIn PDF document text
    • http://dinagujepapure.rf.gd/mamago.pdfIn PDF document text
    • http://suwedafi.epizy.com/buffalo_soldier_chords.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 5164 bytes
SHA-256: 6eb279e24dcbb522d9599f25f6a35ecd4eb483c218d1c22359cd27f979445da6
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10900 bytes
SHA-256: 25c4f19d1db2a90468b3f8a0f2d462ccc14d730ba9f2d7317d926f89df72cbe1
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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