Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3138aa8a50416f…

MALICIOUS

PDF

89.4 KB Created: 2021-04-10 08:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4a1551b6bd6b2747aab838584c860c06 SHA-1: f8c9b855e6e8e668f25ca581b233bfc856238b26 SHA-256: 3b3138aa8a50416f54148f0bc515549658761af25d5078fa04ef0ef93e6538a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lozipotod.ru/strik?utm_term=off-white+look+meaning PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/best_nature_for_single_strike_urshifu.pdfIn PDF document text
    • http://jevopapivixepe.iblogger.org/happy_chocolate_day_video_song.pdfIn PDF document text
    • http://ekzo-fruit.ru/laberunovaboriseo1zav.pdfIn PDF document text
    • http://italywom.space/sanisubusuobni3.pdfIn PDF document text
    • http://lafutib.sportsontheweb.net/cps_calendar_2020_19.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/Jsjhgcu/volta_charging_headquarters.pdfIn PDF document text
    • http://belldiscount.ru/3208260821941c3h.pdfIn PDF document text
    • http://criticcxck.space/how_to_get_a_covid_antibody_test_in_georgiaxvkq4.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/midas_touch_book.pdfIn PDF document text
    • http://newser.site/pesanogesesek8nfrv.pdfIn PDF document text
    • http://dalnoboyi.xyz/nekurerulajasakebulires5yje.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/NsggJgj/swamp_attack_game_for_pc.pdfIn PDF document text
    • http://nanutoz.22web.org/elsevier_journal_paper_template.pdfIn PDF document text
    • http://bachanalytics.com/36542029436u6wci.pdfIn PDF document text
    • http://trackcreditscore.info/bloons_td_6_10._0_apk35eop.pdfIn PDF document text
    • http://likujamozajowu.22web.org/89386886223.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://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_73f81056cd544680bcb6d1240fdf77ce.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_5556472678c54a97b7bc61637ab34888.pdf?index=trueIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/27466304646.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/what_does_the_phrase_well_wishes_mean.pdfIn PDF document text
    • http://bimimikojawador.rf.gd/54518895851.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_590d82ba60734eafb488c427b75cfcdf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 4908 bytes
SHA-256: 43ab93e6ad9c00d06a35189a0d061f0176af8dce35f2588941601e39dde25485
font_01_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10808 bytes
SHA-256: 656dd1951c5860439a5e3709e8bb78967dceacbcdc49c4f4e58ae4731d6971d2
font_02_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off000149d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e