Malicious PDF — malware analysis report

Static analysis result for SHA-256 7430e25a99ea235b…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 22:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6748fd8b5149961a730cce0beb7fb634 SHA-1: 15831616bbf88a91d6ab63ed0d462e0dce722ff7 SHA-256: 7430e25a99ea235bb67f252ad4b494658821fd0649373d5639cdb8ac8b369631
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. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://zajinet.ru/wix?keyword=marauder%2527s+map+guide+to+hogwarts
    • http://lagulatobir.iblogger.org/attention_joji_piano_sheet.pdf
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/kokugatanaw.pdf
    • https://lupojevoken.weebly.com/uploads/1/3/4/4/134468235/557103.pdf
    • http://worldhold.online/lekapozanepedqmtd.pdf
    • http://nalutomabesuso.iblogger.org/angelology_danielle_trussoni_download.pdf
    • http://rezonansmusic.com/theophylline_davis_drug_guideq4ymm.pdf
    • http://jedusajinud.mygamesonline.org/99677989920.pdf
    • http://vegifeda.mypressonline.com/forbidden_psychology_101_free.pdf
    • http://dosaxixapaxa.medianewsonline.com/constitucin_poltica_de_mxico_artculo_115.pdf
    • http://vapurese.22web.org/astrill_vpn_free.pdf
    • http://fafuzum.sportsontheweb.net/61833715048.pdf
    • http://lbaranaydin.com/29176302019bjn7h.pdf
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/5985796.pdf
    • http://donbetosstreettacos.com/present_perfect_active_and_passive_exerciseshy90f.pdf
    • http://nashremont.site/happy_endings_margaret_atwood_shmoopmx948.pdf
    • http://ribavid.medianewsonline.com/ariston_washing_machine_ar6l85_manual.pdf
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/darofiguwibizenebup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/501151b3-7a16-4d1a-8477-6d7b19838454/32703661903.pdf
    • https://uploads.strikinglycdn.com/files/8ecf87a9-0a5f-4912-b635-fc6a3acc87f6/ganitelerutin.pdf
    • https://uploads.strikinglycdn.com/files/b0f7c8de-7101-4d27-a2f7-ab372735218d/73619489253.pdf
    • https://uploads.strikinglycdn.com/files/177e02d2-bcc3-4694-b533-2c55d44a837c/90750864968.pdf
    • http://wotikuvejuf.rf.gd/schwinn_240_recumbent_bike_manual.pdf
    • https://uploads.strikinglycdn.com/files/a1790b84-e84d-421a-b451-6c244b57131b/clinical_cardiology_made_ridiculously_simple_download.pdf
    • https://uploads.strikinglycdn.com/files/22e3b19d-f233-4b2d-9f9e-f1c0bc56eb54/70932940134.pdf
    • https://uploads.strikinglycdn.com/files/946a4a87-7652-48f5-b65f-381ccc3d2ea8/43379752691.pdf
    • http://boparozib.rf.gd/how_much_does_a_director_earn_uk.pdf
    • https://uploads.strikinglycdn.com/files/ecb956f2-bf2f-4f0c-8c27-e6cb8fe33998/what_episode_do_lawrence_and_holo_kiss.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin
1a97456a8a79dc334a60837c979548493a2aff08de27f31d0e6bb2fffb52d54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5472 bytes
font_01_sfnt_off0000f37f.bin
4103de0b9cdca763abc29d1f7a199017b292852491089eabe6f9f3997a4f0486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 11040 bytes

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