Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f28bd88c3380c2c…

MALICIOUS

PDF

90.7 KB Created: 2021-04-02 12:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb42f47984d7b772d7d807d1c58dd053 SHA-1: b357a41cbce709a832f19b896796ebc20c35e6b6 SHA-256: 0f28bd88c3380c2c9e0ff3f1a13128ad840bde366d5ca37706b57ec68b71ce3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=bodmas+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/pulazapusaw/mhfeQjd/nasur.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/gjgi1jc/mit_app_inventor_screen_size.pdfIn PDF document text
    • http://pusolaxunu.66ghz.com/tekaxutuvepezisilid.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/W1IhftA/wood_carving_books_free.pdfIn PDF document text
    • https://cdn.sqhk.co/puzonexus/gjjeheV/graphing_linear_inequalities_worksheet_answer_key.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
    • https://s3.amazonaws.com/najubu/82380378802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394019f0-3137-4481-859e-8292b33fdf80/why_my_furnace_is_not_heating.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_6b16833f0a8143a88a0d627410ad8fce.pdf?index=trueIn PDF document text
    • http://forafunivotefu.rf.gd/40473521966.pdfIn PDF document text
    • http://mafevela.rf.gd/lol_teamfight_tactics_items_guide.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_88397b04ba3b42e79efdec91fc1d82ca.pdf?index=trueIn PDF document text
    • http://bekitidemese.rf.gd/91569955788.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/66584424331.pdfIn PDF document text
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_68067441c61a4473901eaad3419f9608.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5804a11-8ac2-4f27-a6a9-a40ae6b33f2d/tabla_periodica_de_los_elementos_quimicos_concepto.pdfIn PDF document text
    • http://wogenulelo.rf.gd/61228411012.pdfIn PDF document text
    • http://nekogepi.epizy.com/epi_info_7_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/free_template_brochure_fashion.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/met_police_report_a_crime_online.pdfIn PDF document text
    • http://moduvodaw.epizy.com/dojesomote.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_4c34c985a3a04257a9cac1f535877fd5.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_579048cf477045968d546f3b74900980.pdf?index=trueIn PDF document text
    • http://rokodejufoda.rf.gd/both_sides_now_sheet_music.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_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 5304 bytes
SHA-256: b1af606a4f4a521d55df01695d2a7fa2df3ad57b4997cae7377202569448b0de
font_01_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 10572 bytes
SHA-256: c8fd4a29be7e10d27dc1bb29f9d1aea550eec504254214a6a7091fd367ca3179
font_02_sfnt_off00014d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D78 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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