Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab9362b389c57c5…

MALICIOUS

PDF

82.3 KB Created: 2021-03-26 00:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17383819e3a8db12b5e598f4b134fe91 SHA-1: 248ece5700afcb896b9ecdcda2eb61e0544ac3f6 SHA-256: fab9362b389c57c5d0312c885b4902f2e8c27563cacf95929706d91ea437bad0
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 to PDF files, suggesting a link farm for SEO or traffic generation. One prominent external URI, 'https://jumiwimov.ru/strik?utm_term=spss+survival+manual+7th+ed', indicates a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=spss+survival+manual+7th+ed
    • https://cdn-cms.f-static.net/uploads/4470553/normal_60482ea396424.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_6051ff8eb6fd2.pdf
    • https://cdn-cms.f-static.net/uploads/4471085/normal_603665bf8f535.pdf
    • https://cdn-cms.f-static.net/uploads/4452618/normal_6050d4fabdf2c.pdf
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/lipefeduwo.pdf
    • http://gepexoliv.medianewsonline.com/54323642448.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/1e8e1d6.pdf
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5fda7eccb7af7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b01b81ae-cf52-4df5-903c-9daca384e3cb/life_coach_career_advice.pdf
    • https://s3.amazonaws.com/fekife/progress_in_mathematics_grade_3_workbook.pdf
    • https://s3.amazonaws.com/debiwelof/adobe_premiere_pro_cs6_tutorial_beginner.pdf
    • https://s3.amazonaws.com/gekojulog/mesorowomaz.pdf
    • https://uploads.strikinglycdn.com/files/f12173f5-8643-457b-a028-446d8262b468/89871664514.pdf
    • https://uploads.strikinglycdn.com/files/18f04023-79b8-4624-b4d4-e889e54a4b3d/how_to_add_logo_to_wix_page.pdf
    • https://s3.amazonaws.com/tarizirefevifab/charades_app_category_id.pdf
    • https://uploads.strikinglycdn.com/files/672d3ee9-3931-492f-bc5f-f34a22f35ee4/plantillas_plan_de_negocios_ppt.pdf
    • https://s3.amazonaws.com/litunux/weekly_calendar_template_word_doc.pdf
    • https://uploads.strikinglycdn.com/files/3550e2f5-45a6-4270-abaf-aa4342c0b946/57799453885.pdf
    • http://nononulavojiki.myartsonline.com/46203895374.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_off0000f6c1.bin
2d9db6196d3fc96cee5a0e3e327955e9dfbaafe414c76bc696dbcce445297ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 5216 bytes
font_01_sfnt_off0001084a.bin
bd6b1a3b232e5b84eeb0eed89f71152a59c3569de53b435bd507d50d6d443eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11456 bytes
font_02_sfnt_off00012d58.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 4324 bytes

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