Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da6b18a8f01613…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 02:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05ae9882e686e6d6a0befb13b850299f SHA-1: d895ee52f28d5a9a44470e6e71a038ef883e2602 SHA-256: 26da6b18a8f01613993066ab3ea974a70dd0c34c3645c35ee1971a34eb93671e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of linked PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=antony+and+cleopatra+critical+analysis+pdf
    • https://cdn-cms.f-static.net/uploads/4488604/normal_605b3ebe56c85.pdf
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/65cbdababbe6f8.pdf
    • http://lnstagram-verificationbadgeform.com/american_experience_the_poisoners_handbook_movietdsk9.pdf
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/gogeluzobir-jazorekili-mavagutelu.pdf
    • http://bowodimi.iblogger.org/nexifamikovot.pdf
    • http://babitilakibo.mywebcommunity.org/xepupogufifatixa.pdf
    • http://aycotoro5.xyz/videos_sponsored_by_monster_legendsmyh1p.pdf
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/dinexida_xubebodifowa_nafen.pdf
    • http://pifafixejizigu.scienceontheweb.net/47539710959.pdf
    • http://ses-sanobrabotka.ru/paper_due_now_reviewsio6w4.pdf
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/2409033.pdf
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/petuval.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_604ce1f93b4dc.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5fdc4dc46e04b.pdf
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/f460c0d4f695c.pdf
    • https://patakobenidirok.weebly.com/uploads/1/3/0/7/130775678/9601181.pdf
    • https://tipuzinugex.weebly.com/uploads/1/3/2/6/132682040/lejafedemi_fexesow_mubomar.pdf
    • http://kenugizi.getenjoyment.net/89606962842.pdf
    • http://ideaita.fun/ge_18_quart_roaster_oven_turkey_recipe1f89j.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/8033ca9a4a2.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/c7ad4b73d9.pdf
    • https://cdn-cms.f-static.net/uploads/4468871/normal_6056f21f08208.pdf
    • http://tumbaa.space/17588871086wexni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gelisufaw.rf.gd/gosazamejuvezumivopeperop.pdf
    • http://gagolabirej.atwebpages.com/koxetogipejuxofofurez.pdf
    • http://xobebol.onlinewebshop.net/71506811395.pdf
    • http://wuzepebiliza.rf.gd/ayyappa_swamy_bhajana_patalu_telugu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b6.bin
0d6f924cce35dbab6c623ef0564a1b5050653aaabf55f75c2661221cd0e6d465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 5028 bytes
font_01_sfnt_off000102df.bin
7c3e40b312148e61b9e29d16dabec582c1e9c4dd779093e2fef1fd4879bf9da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10656 bytes
font_02_sfnt_off0001271a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 4324 bytes

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