Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fbd7239672d642…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 18:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c438f7fc860a3669d57af1a379251af4 SHA-1: 7b2a35b7e0f73cca39bd84899e0d02a4c4e124bf SHA-256: b3fbd7239672d6425e16f932a0500c4a0a30aed69b27cab21b1f769f26c11b7f
164 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm and a lure to convert PDF to Word on iPad. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/award?keyword=convert+pdf+into+word+on+ipad
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/297260.pdf
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/2883632.pdf
    • https://gojamomer.weebly.com/uploads/1/3/2/8/132815882/fowazatadevuvo_xarujosudok_pubuluputetibis_mojovedotode.pdf
    • https://loponulofaxoli.weebly.com/uploads/1/3/4/3/134324484/pusazuvisejor.pdf
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/zomiburuzepukitadusi.pdf
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/sifomatifizapuzemoz.pdf
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/bewowuresewava.pdf
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/lajiziw.pdf
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/divadarapegoku-boravewulakoju-zinaguxabumod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/waxapoz/simple_present_perfect_tense_exercises.pdf
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_c7b406d611e54d6f963828d22992e365.pdf?index=true
    • https://s3.amazonaws.com/zagapaxa/payu_payment_gateway_android.pdf
    • https://s3.amazonaws.com/xukonakefules/jewaxinakejimovud.pdf
    • https://s3.amazonaws.com/tutapaxi/96418972790.pdf
    • https://uploads.strikinglycdn.com/files/f6b08551-db9d-46ac-89e6-a650fbd2dd1b/reading_comprehension_third_grade_common_core.pdf
    • https://s3.amazonaws.com/dusubonifu/cv_template_word_format_free.pdf
    • https://uploads.strikinglycdn.com/files/41416cc5-acb4-4703-a679-6da1b782d1c6/37730241656.pdf
    • https://uploads.strikinglycdn.com/files/c5d78007-933d-4e74-a7be-85319e1e5e87/xemigagibonomido.pdf
    • https://s3.amazonaws.com/figidireki/87146588153.pdf
    • https://s3.amazonaws.com/bulolimepol/65477730572.pdf
    • https://s3.amazonaws.com/muwomapotumugi/can_you_dance_regionals_2020.pdf
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_ac2ef50e80044eedb3565b0f57f82e86.pdf?index=true
    • https://s3.amazonaws.com/kovezux/super_systems_clean_plus.pdf
    • https://uploads.strikinglycdn.com/files/bfa1e2c1-d63d-4565-93aa-c99ed60b7706/12184645586.pdf
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_eeb7c8d35a0d4c68943a28df5eca5851.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c1.bin
cdcd7b3088a54b575fefe6c24f3c74522c5afb440f98e5e2084e43d81a33e61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 4788 bytes
font_01_sfnt_off0000f32e.bin
33c3db1a8f7e48373c77dbfc5d83f35c4800c7cf86075145a325ed4c78a0dc4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 10616 bytes
font_02_sfnt_off0001175a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 4324 bytes

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