Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed3b0458f431bbe…

MALICIOUS

PDF

101.2 KB Created: 2021-05-12 13:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e277150e2cbafc7d16cb6d0258301550 SHA-1: 76579259cacfa3343635b5ffbf2e465ec3e56289 SHA-256: 1ed3b0458f431bbebd29a8efefc99ba60fd679ded674a8133fcac4bcac3289bd
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=wordpress+tutorial+videos+download'. Additionally, the ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'Wordpress tutorial videos download'. The presence of malformed streams and a large number of external links further support a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=wordpress+tutorial+videos+download In PDF document text
    • https://cdn.sqhk.co/nigudovowa/uDjbguG/3d_snakes_and_ladders_board_game_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_603e8c261c94f.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/12d64efa32f0.pdfIn PDF document text
    • https://cdn.sqhk.co/vogidasobe/FjbC3ih/senemak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fef9565ebf17.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/5df907c21df0ad.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/QTWUihv/91783554711.pdfIn PDF document text
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/jozagesilam.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/kirunudiritej.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/ZDyURha/the_chocolate_factory_movie_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_605d765566411.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/ghjjih3/ark_overseer_boss_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5fd2c0a861b3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/e769937c-0fc4-4f85-a6a0-17dc9d608f79/wukobafadudegibepotumoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5096a868-d57b-4901-a487-b9d9b9345391/asp.net_mvc_user_login_example.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/1275312483.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/63464320603.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/17376009689.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/arcaea_mod_apk_2._1._0.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/segarigo.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/convocatoria_becas_internacionales_mescyt_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/toshiba_dvr620_dvd_vhs_recorder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/vuruzotenepofogenarebufog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6afaef24-e344-422a-af03-38f1d052a6e4/harry_potter_book_online_purchase.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 5120 bytes
SHA-256: e64c8f57e20a1503a82bd32009726a756d07a5a058f41851a1567d5d75f1f361
font_01_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 10608 bytes
SHA-256: a3b5a660eb19bbfa114a0f841a2ce6ca13041c9a9a8f087940223352229399cd
font_03_sfnt_off000155f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F7 15920 bytes
SHA-256: 60f92eefa53380a8c3666eace16df7c2aa9ae194f68f16b6e91bd606d40016f8

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