Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea88b77d38a99aa2…

MALICIOUS

PDF

87.1 KB Created: 2021-04-02 19:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0c049ff1e835c11b4ca5165acfd751a4 SHA-1: b02d18febe9385a1eb6c31926a808e810257454b SHA-256: ea88b77d38a99aa201bd9de654b0c345099661a8b8ad1e976771ca45698fb441
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicate a phishing or malicious redirection scheme. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/aws?utm_term=city+of+glass+paul+auster+summary+by+chapters PDF link annotation
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/641443.pdfIn PDF document text
    • http://armada.technology/19763402130i6q9f.pdfIn PDF document text
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/57fd5c.pdfIn PDF document text
    • http://masalev.ru/87675795341t29ia.pdfIn PDF document text
    • https://regifedemez.weebly.com/uploads/1/3/1/4/131406591/ranunuxabisew.pdfIn PDF document text
    • http://wadigajore.22web.org/itil_v3_certification_cost_in_chennai.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/54830.pdfIn PDF document text
    • http://sumagezemorewo.22web.org/jonozobabofonekox.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/jigenu.pdfIn PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/32442.pdfIn PDF document text
    • http://yesstore.pro/tidosiwer1mr0.pdfIn PDF document text
    • http://naturebiolog.fun/what_is_nuclear_reaction_in_physics5di9i.pdfIn PDF document text
    • https://zipifotudesa.weebly.com/uploads/1/3/0/9/130969604/tarepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mivuturirem.rf.gd/intent_in_android_javatpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/39773701541.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/creative_resume_maker_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/what_is_the_quickest_cycle_on_a_washing_machine.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/9898844987.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/honeywell_t4_thermostat_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/rixisolofapikosajijejogov.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/xajamilakutim.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/xonomipolotepalulix.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/kigoravejarutal.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/89110615164.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 5576 bytes
SHA-256: fbbfac10a6f79acd373e65e021b2f96e73acbfb9bc341e8f5cb449c22e3eb7fd
font_01_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 10336 bytes
SHA-256: e2ad244dbd56ca6bee3245c73f7d69ccb5de512c5fb07c45e60f515ce990a845
font_02_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449