Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e270e4bd34ecd5…

MALICIOUS

PDF

86.3 KB Created: 2021-03-08 23:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ba2fd5f5c01105bba11db886027964 SHA-1: d66c5746944a14471f89db2a974ae3241902caa5 SHA-256: d9e270e4bd34ecd5b4c1e249255fd53eac7e6b91689602d51a1d8b5693d53236
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, including disposable ones, under the guise of providing 'airplane games apk mod'. The presence of a 'Download Button' heuristic further suggests a deceptive user interface aimed at encouraging clicks to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • 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.
  • 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://vilenefex.ru/123?utm_term=airplane+games+apk+mod
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/pedowojelizitefimoto.pdf
    • https://cdn.sqhk.co/bularalunop/ijLiigd/wood_craft_supplies_online.pdf
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/lowuga_lofiv_mumifetilefidex_dofaliwo.pdf
    • https://vavonezutama.weebly.com/uploads/1/3/0/8/130814168/9570975.pdf
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/korivowajiral_xakesofajexuzul_wativageko.pdf
    • https://cdn-cms.f-static.net/uploads/4379859/normal_60303f2b5f250.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_603e956f830fd.pdf
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fe0e76ee17a6.pdf
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/c2d6b98.pdf
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/2182678.pdf
    • https://cdn.sqhk.co/wedowetaso/chDig0I/gugejeruruned.pdf
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/9764616.pdf
    • https://seguronudolag.weebly.com/uploads/1/3/4/4/134468074/4931865.pdf
    • http://lelofewadu.iblogger.org/devabuvorekafosapizibix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/76741c3e-bffc-478a-9b95-bc0b8743beab/insinkerator_badger_5_garbage_disposal_amazon.pdf
    • https://uploads.strikinglycdn.com/files/2abc1873-400a-4713-81c6-2c0272d2e087/32331949794.pdf
    • http://ferumodos.epizy.com/36046919736.pdf
    • http://ritifijetib.rf.gd/beautiful_disaster_lyrics_pink.pdf
    • http://takarifidatumo.epizy.com/how_to_become_a_chick_fil_a_red_member.pdf
    • http://supidanerij.epizy.com/july_2019_monthly_calendar_template.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001156c.bin
253b2a74456fc7ee2bbf0d0f00c45ed22db0bf4a265e65e6ca25583d3bae667a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 5332 bytes
font_01_sfnt_off00012776.bin
b70edaa3e658dbcb80a1acd284063da9c00474894f559b799d9780cb38444a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10700 bytes

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