Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61f43a3b7eeb60b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-11 12:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a369e0dc3bdaedd148c65f6fc0d2af37 SHA-1: 25d1ec4c89a3067b530b17d97d415a3386730775 SHA-256: b61f43a3b7eeb60bcd87c36e7a8d23272ee7ca2cc312f54d8aa813ee0fa633c4
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent, possibly for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/strik?utm_term=integration+of+e%255E2x+cos+x+dx PDF link annotation
    • http://muvepifare.mygamesonline.org/50726100147.pdfIn PDF document text
    • https://rixogeki.weebly.com/uploads/1/3/4/6/134693266/kulatokaf.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/98a67e2e1cf4be.pdfIn PDF document text
    • https://rajidorux.weebly.com/uploads/1/3/1/4/131453086/9027513.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/linux_search_for_string.pdfIn PDF document text
    • https://butabefuje.weebly.com/uploads/1/3/1/4/131437434/2216591.pdfIn PDF document text
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/notimixux.pdfIn PDF document text
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/3118708.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/raritegefiju.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://uploads.strikinglycdn.com/files/7f6ef4a5-3ff4-4224-b9f2-bfefbb95a9d2/jipidedajufikidubav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356f769b-d733-4650-b7fc-8315f50bc0d5/73913075183.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/913889124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdc1a0a-c7f7-4ed8-82eb-a02fc1568b15/60249200264.pdfIn PDF document text
    • http://lubozudaxik.epizy.com/76118470691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe67bed-1801-44fc-ac10-1a3076d0177a/bissell_power_steamer_power_brush_directions.pdfIn PDF document text
    • http://foliminuga.epizy.com/teluxinuravujurur.pdfIn PDF document text
    • http://tupazovux.epizy.com/gefolubif.pdfIn PDF document text
    • http://bedigetulo.epizy.com/36328526763.pdfIn PDF document text
    • http://mifevup.rf.gd/fsc_1st_year_biology_book.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/wiwukesalutitokogub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8aa21d-7e8e-487d-a216-7b44c3acb15d/bonaire_swamp_cooler_pump.pdfIn PDF document text
    • http://nijibibikij.rf.gd/2017_all_bollywood_movie_video_song.pdfIn PDF document text
    • http://baxazujokeranu.epizy.com/wusik.pdfIn PDF document text
    • http://nepezuse.rf.gd/raliviwinisapa.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 5132 bytes
SHA-256: ca05e97e247023148c553b0576efc6c07581322564d9ba773e7e1ca522f89d86
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10928 bytes
SHA-256: e5412044744322e2238a09721fe95a3799aed1aa44283998fcd4728797bad562
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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