Malicious PDF — malware analysis report

Static analysis result for SHA-256 103b9e9e46471d2d…

MALICIOUS

PDF

88.5 KB Created: 2021-05-01 05:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4b4ea3dfcbe722d904625490b908912d SHA-1: ed72225c1ab0b58baae9a2af7f46c46fa70b690d SHA-256: 103b9e9e46471d2dd4581c15bb07f2f21980601907daa9afed2eab6326272cd4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=coding+basics+book In PDF document text
    • http://wurenuzuludesu.22web.org/54835612844.pdfIn PDF document text
    • http://intereriia.com/bonidememew5pzdi.pdfIn PDF document text
    • http://albatros-trans.ru/vebonusodenexerukopojaze1276h.pdfIn PDF document text
    • http://lisolu.org/513786034697x3tq.pdfIn PDF document text
    • http://sanadewa.iblogger.org/37801954807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6053555da3e79.pdfIn PDF document text
    • http://msertis.xyz/repairman_for_washing_machine4h6of.pdfIn PDF document text
    • http://nyvelsets.online/falling_in_love_alan_watts_song_lyricslgqa9.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/5333889048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_5ff3a033b2783.pdfIn PDF document text
    • http://remontlegko.info/94036695539r36w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_601efd3962c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5fdc475ce763c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_605d83cede258.pdfIn PDF document text
    • http://mivetys.xyz/how_to_manually_update_kindle_touch_4th_generation8jef6.pdfIn PDF document text
    • http://niverokime.iblogger.org/small_to_word_converter_free_download.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/bushnell_tour_v3_slope_edition_priceo11ta.pdfIn PDF document text
    • http://xviiivbgz.com/mibenena56w9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixagikaw.epizy.com/wemixatiwatetejovijolenu.pdfIn PDF document text
    • http://fijonomun.rf.gd/dawonif.pdfIn PDF document text
    • http://kukalawewo.epizy.com/juririrure.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_31f6412911be486face2a5bf9d638d74.pdf?index=trueIn PDF document text
    • http://doruxexim.epizy.com/pematotim.pdfIn PDF document text
    • http://zowolowoziru.rf.gd/letter_from_a_birmingham_jail_rhetorical_devices.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_388eeb9bb5644a93905c24cb8600b43b.pdf?index=trueIn PDF document text
    • http://lofupiwosilabo.epizy.com/dijasovofosuvupelaxa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 5088 bytes
SHA-256: 27af389a7fda67e74f88511f78660ab53fc8a3567b344fa22d09bc3afbb128c0
font_01_sfnt_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 11760 bytes
SHA-256: 9f45304c009d6a74d229baf4bbb8c66543256da34523d8c9d2b3daff2a7a4ec1

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