Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a1bc2238366c9b…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 20:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea0dd5439f7b44efb578e84deabacfee SHA-1: 553b8e636bf931377c77b463a1edbea544d838be SHA-256: 37a1bc2238366c9bad83c4467873c697e4554fe84ccbd49b73d3d89f96914fe7
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. One of the primary external URIs, 'https://pelibifir.ru/award?keyword=behavioral+finance+burton+pdf', suggests a lure to disguise malicious intent. The PDF structure and embedded links indicate a phishing or malware distribution attempt, likely leveraging social engineering to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=behavioral+finance+burton+pdf PDF link annotation
    • https://vuxorewuv.weebly.com/uploads/1/3/4/8/134861163/474567.pdfIn PDF document text
    • http://btsworld.org/como_sumar_restar_multiplicar_y_divi04l3u.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/why_is_my_computer_not_recognizing_my_mp3_player.pdfIn PDF document text
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/ee07cc5d395cc20.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/wisigejikezejededud.pdfIn PDF document text
    • http://wobifotos.mygamesonline.org/ravubutupamanawifegiv.pdfIn PDF document text
    • https://sedifuwenute.weebly.com/uploads/1/3/4/4/134464273/taginabukeze-zapiziborepezi-bugon.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/periodic_table_in_gujarati_download.pdfIn PDF document text
    • https://sofaruxilo.weebly.com/uploads/1/3/5/3/135309187/04dc9.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/3895432.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/pibusiwe.pdfIn PDF document text
    • http://kraftmann.su/gluten_free_air_fryer_recipes_australiayt2kg.pdfIn PDF document text
    • https://dewokiwo.weebly.com/uploads/1/3/6/0/136028273/5366316.pdfIn PDF document text
    • http://store50off.info/jacuzzi_laser_160_sand_filter_manualizfcg.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/nuxomigo/11093459124.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/59788997236.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/1218290460.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/infinite_warfare_zombies_easter_egg_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/pozepul.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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 5196 bytes
SHA-256: d9e50714398e63da5eee4fdbd3364c04bfe9ea02d6ca25a11e2ffd4b0e9efd33
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 12060 bytes
SHA-256: c61c32a640e98e60eb3df3f9d2df5658e936e9b1884357ed5a25d241ea15e9b2
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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