Malicious PDF — malware analysis report

Static analysis result for SHA-256 663b159d31f12d97…

MALICIOUS

PDF

76.6 KB Created: 2021-04-17 21:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5f350ed09eb503d33d1cacd809cc5e04 SHA-1: 28d67604616ac75697277f032de8e439b28baeb9 SHA-256: 663b159d31f12d97ef8f5206eed4573248a247c5af37c1c6f217cc966efe28a1
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=lg+tv+refresh+rate+100hz PDF link annotation
    • http://gisowutuxa.22web.org/scrambled_sentences_esl.pdfIn PDF document text
    • http://cocobuka3.xyz/mononofatupivinazyvy.pdfIn PDF document text
    • http://vkysnaya-eda.site/lagu_medot_janji_palapajykm5.pdfIn PDF document text
    • http://sushibara.net/cement_sheet_cladding_nzfyujy.pdfIn PDF document text
    • http://nejugikolivakam.iblogger.org/what_is_the_salary_of_a_auto_body_technician.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://givovuzozej.rf.gd/38834396225.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_d78d2437763344719e006251a531596e.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_bb33490b3479434bafcd24cb27dcdecf.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_c3f3d734bc9243ff96b19bb685d25cac.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_712156c6aa5a40fd96e4432c7e923231.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54250fb-cd0a-4c4f-9ac7-130c95b84c19/1089693904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbf4ffc-2be0-4662-aff9-031f0f92b643/9894349846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22eda2b-ad4b-4d75-8df8-cc9f8a15875a/lorozafagutevifopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57504731-3a0b-4647-a6e8-8b638a030617/zowupu.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/speaker_test_audio.pdfIn PDF document text
    • http://veziledijiv.rf.gd/bijirinijuxinoladoragef.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/fokujuk.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_60400fe16db049aaa9411c045f52732b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/hp_battery_calibration_software_windows_7.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_7cb8202bcc174c28b02129b2b9142428.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_4a12409292974493b74b90953ad674fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/guideline_for_hypertension_2018.pdfIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_4eec06545633460d896b5ffeb0f2a188.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_bfb4207e1443427e95644dc1c8d3564a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 5244 bytes
SHA-256: 9f15c543a972fa282d6df671771bc96da235ec8922b084060567ac5cc5180e9b
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10632 bytes
SHA-256: 87607492f4984159c2a84993b4e38e775b62656fe356a90d9f3a403f2d49d5ea

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