Malicious PDF — malware analysis report

Static analysis result for SHA-256 40055b6f2ad2058f…

MALICIOUS

PDF

96.1 KB Created: 2021-03-21 12:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0244a010c7e54d32584510abd43bbe SHA-1: 50a99b81ae3c2d1a6be7f3a890a02f9a40c0674a SHA-256: 40055b6f2ad2058f230e930647f6189fe8a17b5eeb87fb01b7554e8f27b188fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm of numerous external PDF links, with one prominent URL leading to a download for an APK. The document body, though heavily obfuscated, contains text related to downloading an APK, reinforcing the malicious purpose. The presence of external links and the lure for an APK download suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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://jottigo.ru/wix?keyword=download+keyboard+apk+free
    • http://nopotaz.medianewsonline.com/bussmann_glass_fuses.pdf
    • https://cdn.sqhk.co/fivufotimad/M8fhUgh/lusosewomorimu.pdf
    • https://cdn.sqhk.co/wupetutigo/iac7qic/wumimebawabatigixibup.pdf
    • https://tafugamukizigip.weebly.com/uploads/1/3/0/7/130775106/vajet-xesawa-jadudafu.pdf
    • http://lnstagram-helping-centre.com/wopinilgcyli.pdf
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/risedoxodufemixe.pdf
    • http://igme.site/football_manager_handheld_2020_tacticsuqzij.pdf
    • https://tomoniwibisuxis.weebly.com/uploads/1/3/5/9/135961627/jopizujomopese_lipujuk_noluxufofod.pdf
    • http://haustova.com/bbc_english_class_11_literatureyymo6.pdf
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/e9425573.pdf
    • http://fizebiredasibi.mypressonline.com/93338086756.pdf
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/tuzix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e7337dff-a010-41a8-9f91-786f6323e5bc/80992911211.pdf
    • http://novupomajanox.atwebpages.com/80387033253.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_9fb0372a6126472d97d9b5a41c2ee2af.pdf?index=true
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_ef74c829d7ef4479bcb376358ea0b125.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7be35c5-0cb9-46ec-a57e-ac14251ae40d/does_hannibal_lecter_ever_say_hello_clarice.pdf
    • https://uploads.strikinglycdn.com/files/6d00899b-7933-4d13-bef9-d63514468d15/31865260235.pdf
    • https://uploads.strikinglycdn.com/files/9f4c7cf0-fa47-4145-b5f3-6d2a62770a35/proceso_de_la_investigacin_cientfico_social.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_b54beb0684c648538abf604253540eda.pdf?index=true
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_5b899137216646b59cc1e0a45887a3b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/001ba950-5c9a-40ac-be47-063ae41d2c68/80781433397.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001131b.bin
2ddb1d85e1a72ed42fda7010077efa7da5c34bac025779d9a4363ef001a766cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 5256 bytes
font_01_sfnt_off0001251b.bin
924d6c74a4d4874202639306edde7add662b96fc8e2f5ed600590950d2d24a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 2968 bytes
font_02_sfnt_off000131bc.bin
ab279dc6cbe1923f3f0d178bda93571084245dd8595378fd0bb120320915941f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 12156 bytes
font_03_sfnt_off00015b06.bin
326aa179db3c304dbc05ef3fb955cb53856685882a1ec9f02c45d2c7f2687d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B06 16680 bytes

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