Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f06b3a7a9c7617…

MALICIOUS

PDF

91.7 KB Created: 2021-05-26 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d909d602ac1a941237695e8b03c216a SHA-1: c2591d49a763782946856ab6f979cb496951dd46 SHA-256: 53f06b3a7a9c761724757d0e0d2d9f4c9cff2c5dda369f5f02ef364e8dbac085
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 pointing to seemingly unrelated documents, indicating a link farm or SEO spam tactic. The primary URL, https://xezojetit.ru/strik, is likely used for phishing or to host a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+shuffle+cards+for+beginners
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6030941135ae7.pdf
    • https://cdn-cms.f-static.net/uploads/4491426/normal_6048650f2e170.pdf
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/zipupenomifad.pdf
    • https://cdn-cms.f-static.net/uploads/4486521/normal_602b294065eb5.pdf
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/2259941.pdf
    • https://veretiwuwe.weebly.com/uploads/1/3/1/4/131406621/xuvazemapav-lojuwunegikonu-duzus-wunak.pdf
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/sekixi.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/lovugezizinejap.pdf
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5feef499027ba.pdf
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5fe084d0a159f.pdf
    • https://cdn-cms.f-static.net/uploads/4455902/normal_60122501cdd80.pdf
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/8224065.pdf
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fff6f49831ad.pdf
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ffdf153a0205.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/06b9d1ca-5a31-4d6a-a644-74a5aea39ea9/does_stretching_prevent_sore_muscles.pdf
    • https://uploads.strikinglycdn.com/files/7cc05b07-0239-476c-aad1-113d9788487e/sesogedirenodigalulifafej.pdf
    • https://uploads.strikinglycdn.com/files/a9b3ecb0-95d7-42a5-b2af-6b44e7e85093/30_day_clean_eating_challenge_clean_food_crush.pdf
    • https://uploads.strikinglycdn.com/files/da1e117f-6553-47ae-a863-dbc1e6e6a422/fegada.pdf
    • https://uploads.strikinglycdn.com/files/1804c6a8-3d08-4666-bdde-fa4d67b31707/sexabuluvikajozu.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_off000117b6.bin
59ad1db0b948c2e1adff4eb8cf9a0f6c3699393ad483d040b0503e7ec241a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 5360 bytes
font_01_sfnt_off000129f7.bin
9f9dc32b215d92e632153b24242b54724087ec55e281df8da8f37e277b11a23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 12704 bytes
font_02_sfnt_off00015357.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15357 4324 bytes

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