Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb72c01a4341e8f…

MALICIOUS

PDF

83.7 KB Created: 2021-05-15 21:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8315b1900583bbf6d5848c29e4f2dab SHA-1: 705097033b574968d307688c57bb7995433c2a94 SHA-256: fbb72c01a4341e8fc909b8e00aea63c94d89b5ae0299ff7578d2af1d9b6f9f7d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=singer+sewing+machine+serial+numbers+uk In PDF document text
    • http://dusipoweg.mywebcommunity.org/gobomadoketaxud.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/jemuvidot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60510e2eade27.pdfIn PDF document text
    • https://jaxanawunolat.weebly.com/uploads/1/3/0/7/130739567/xitazuwurapu_nofiruxugeveg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_6039f747824c2.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/18981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_600c5cff1519d.pdfIn PDF document text
    • https://sazopugewado.weebly.com/uploads/1/3/1/4/131453094/wumukel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5ff8cba4cbdd9.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/sosalos-suzuwebisalozim.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/8a519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_6000ef172e1bd.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/10535854342.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/68126453436.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
    • http://dolanuvusipegu.myartsonline.com/sustentabilidade_economica_social_e_ambiental.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/46119045220.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/86593010967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa79e55-e428-4af0-81fa-7a265518b696/the_sign_and_the_seal_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263d54dc-b08c-4ec1-99dd-54702ba92190/firex_120-890b_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/solar_powered_battery_charging_system.pdfIn PDF document text
    • http://muliwavanebebo.onlinewebshop.net/vitariga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e38966b-9611-4830-9be7-fabf649e7430/xavivitojoruxexavijes.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/best_sat_prep_book_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/is_a_convection_microwave_better_than_a_regular_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6cf3f1-504d-4750-8e44-85c22d79a609/5155650353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5697e5-6453-49f0-b804-56ceef5ebd49/45367028468.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_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 5304 bytes
SHA-256: b1a4dfa8156ef20120005fa543460d43f8892c12914c72a2c8de3f9fbe5770dc
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 11152 bytes
SHA-256: a0f6f821052941c84eee75d07ee4dfb6c2a76e9c36e0a1b46abe525a8b162676
font_02_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176