Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d551d68357a18d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 00:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1f6de7ef5ac79b9dd3b74050368041fd SHA-1: b4880d442dc609ee551a2029e808664733726745 SHA-256: 92d551d68357a18d4654efa0fe590eddf0f98768b88137f35c08c6c8312614e2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URIs, one of which points to a raw IP address, indicating a potential attempt to host malicious content or redirect the user. The presence of numerous links to various domains, some with UTM parameters, suggests a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kimcert.org/E/file/jamabumabawufexutiwe.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hadgepoltlsdco0lslbo6ufvj3/56924974324.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58840096731.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/8433674846.pdfPDF link annotation
    • http://ltpbetel.ro/userfiles/file/jupoj.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/79154935913.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/kiruluzabonidafibeki.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/83025047574.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/18674519482.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/99209717336.pdfIn PDF document text
    • http://chengzechem.com/upload/files/butaniroke.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/topunidigufukuvi.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090508528672.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/89220208668.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6bc2b335---27291027615.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/sakisa.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/natejinatofajutozi.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/68646095325.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/rodigiluwabalimaruv.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/zepimepakusud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=call+recorder+pro+apk+free+download+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 17092 bytes
SHA-256: 9700b77d646dc4ce8cfa0ea2fbcbbf5dfc961261e35b4bde68aa9f5ae4aa1fb7
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 10556 bytes
SHA-256: d920963b9520e1a1345f1fc68de7c22da5e7edd39e73807c25b209744beb01dd

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