Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9187fbfece48509…

MALICIOUS

PDF

145.4 KB Created: 2021-03-27 16:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bc5db6c0cd69f13b7241ada4012efe9 SHA-1: d2d7355f4c7b52b9eb1de286682192dbccaa9e77 SHA-256: d9187fbfece4850947c0ec43a320427bd21124fccea5cff27e87644afbb88754
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://midufefew.ru/wix?keyword=biggest+wolf+ever+caught` is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://midufefew.ru/wix?keyword=biggest+wolf+ever+caught
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/5edef.pdf
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/kipudedu.pdf
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/pudopisapujumo.pdf
    • https://cdn.sqhk.co/dejijadu/mgiajgS/the_fat_rat_perfect_ringtone.pdf
    • http://vemelaribox.getenjoyment.net/86441692164.pdf
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/5380643.pdf
    • https://cdn.sqhk.co/dodiniwotud/loj1nig/jaxitu.pdf
    • http://gezinuduwep.medianewsonline.com/coraline_book_english.pdf
    • https://cdn.sqhk.co/tamejenonisi/IjigfoY/run_race_3d_unblocked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/70f22abb-a804-4a02-9532-d6cbf9fa0aaf/89042762825.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_130df59339844a1e916eb1eb6a65cb44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae353f70-7c10-4819-a769-aead204cddd4/what_should_i_write_in_self_performance_appraisal_example.pdf
    • http://sabixukavizom.myartsonline.com/ketexuri.pdf
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_29f607156c1c4f3ba2c269fece021086.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98ab7e93-02d2-450a-b935-f5c65336d471/26300832124.pdf
    • https://s3.amazonaws.com/zumomasugipeno/dibond_sheet_cut_to_size.pdf
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_a3178149bc5e4680a1331e5bb87db717.pdf?index=true
    • http://wojibikifi.myartsonline.com/how_to_access_apps_on_lg_smart_tv_with_remote.pdf
    • https://s3.amazonaws.com/girilifawuxi/98012317062.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_4b8d635ce4544b82b107dfd554ad4c79.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_baa54036213342be86093fcd210f74cd.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e407.bin
1582cbd2492adca686ec7975baf8e6d6f25d4a43dc44a908751b8b4694bf5055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E407 5120 bytes
font_01_sfnt_off0001f59d.bin
423b883613f9711ee00c1af836fc994a935659a3d09d5020b64e4ef83e08fd98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F59D 1716 bytes
font_02_sfnt_off0001fe44.bin
5b197a82d82e23bc9cccb5d66afeaf3261f2471fba08611f8ab4df2eb823d14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE44 13836 bytes
font_03_sfnt_off000228ff.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x228FF 4324 bytes

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