Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a22f2a180469ea…

MALICIOUS

PDF

95.8 KB Created: 2021-03-18 01:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75337a46b87b1dcdd8dae63bf8f01568 SHA-1: 17face21b81b2cd913630bda76a60ac2c2c4870f SHA-256: 61a22f2a180469ea86f61b22420e2a4017a656a8662fe4b347e751f52cde7dc6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=ielts+academic+writing+task+2+sample+questions+and+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_6017324b16dca.pdf
    • https://cdn.sqhk.co/sivefuxonix/hejdivP/final_fantasy_crystal_chronicles_remastered_edition_price.pdf
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5feee057a1eed.pdf
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/60584d9c47185a.pdf
    • https://cdn-cms.f-static.net/uploads/4427529/normal_6020436c5385d.pdf
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5fe097b99e668.pdf
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ff845d1cfea0.pdf
    • https://cdn-cms.f-static.net/uploads/4415302/normal_601119911929c.pdf
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5ffe539215254.pdf
    • https://cdn.sqhk.co/tisojubew/fgjdAjg/sifokejomobufurinegemevax.pdf
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/99143586181924c.pdf
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/9696938.pdf
    • https://cdn-cms.f-static.net/uploads/4495264/normal_60214da68a99b.pdf
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/lifunud.pdf
    • https://cdn.sqhk.co/fodumisux/Phg4FQj/12663073725.pdf
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/sudodexotex.pdf
    • https://cdn.sqhk.co/gixedomawa/QgiQjcr/24450928825.pdf
    • http://dosaxixapaxa.medianewsonline.com/kawobotarolejof.pdf
    • https://cdn-cms.f-static.net/uploads/4403282/normal_603d04aa2000a.pdf
    • http://bibuzikufaje.mygamesonline.org/tactics_by_gregory_koukl_free_download.pdf
    • https://cdn.sqhk.co/bijininabex/Sjh8jeL/phone_app_radar_detectors.pdf
    • https://cdn.sqhk.co/nisisepolo/iEjj4ua/blackmoor_duberry_s_quest.pdf
    • https://cdn.sqhk.co/lipisedopila/ij8i5je/game_superstar_fashion_girl_mod_apk.pdf
    • https://cdn.sqhk.co/gogoturowib/7ehjgjt/pollmann_kontrabass_zu_verkaufen.pdf
    • https://cdn.sqhk.co/zeliravepuj/mggLghg/1837008134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000137a2.bin
3f0f1bb33a7615e33549a4b5da6f93970ea3690495b1e8229552a0e049094f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 5828 bytes
font_01_sfnt_off00014b75.bin
1a74a3a40eea8d05691dba7c5789b309a401a5d81da67ae1ab88f398810acae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B75 10444 bytes

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