Malicious PDF — malware analysis report

Static analysis result for SHA-256 918a9f41f6ebf550…

MALICIOUS

PDF

120.9 KB Created: 2021-05-20 11:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee792ff80a076fb31b6a8cb621ceabf6 SHA-1: a4dfe191dcbe4e7a488bbd1fa72a049a088aec28 SHA-256: 918a9f41f6ebf550e7c3b38b928169475ed2ed942fbd3f5abba6e6d69f7923e5
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=gta+4+crack+1.0+7.0+razor1911+download PDF link annotation
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/wuvadut_wigute_xigeniwusapegab.pdfIn PDF document text
    • https://vujedivu.weebly.com/uploads/1/3/4/7/134768767/6012949.pdfIn PDF document text
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/xabafapukipej.pdfIn PDF document text
    • https://pexevirojaloko.weebly.com/uploads/1/3/4/8/134882405/xuwunosijomeru-sonudematovirir-pijusamaweret-gefoligegelidox.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/geraki.pdfIn PDF document text
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/vaziferiri_zokumiguju_zivuzaj_somirexepi.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/8426205.pdfIn PDF document text
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/26795c47c4.pdfIn PDF document text
    • https://vufoduvetuf.weebly.com/uploads/1/3/5/3/135302170/2333301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/96726dbc-17d1-4512-95b6-77c58f84bc6f/kerosomamavobojofub.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/alamofire_image_swift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3acaed-824b-4356-976a-f2608108db6e/05_pathfinder_overheating_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/60957758598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8969ff4e-e518-4d25-ae37-322c6220e884/35628652087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f71c46-81ed-497a-931d-fd479eb92e99/witcher_3_prima_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06bb874-a4bb-4922-a43a-06daa95e701c/rii_wireless_keyboard_and_mouse_rk200.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/napigokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92556a5a-46cd-4997-ad67-c67aa33786ad/how_do_you_find_the_magnitude_of_the_normal_force.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45068fa-76c8-40fa-8ead-b9aced5bb96a/jusokovifererozetunadewu.pdfIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 14440 bytes
SHA-256: f02ae325591d94b05f625a54deba8812e4162b97f5c53b669309840ee30bba0e
font_01_sfnt_off000157b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B0 5544 bytes
SHA-256: 0060c57353a51fad3cae17e6b78ac3e34f19387b4bb6b79dd4ef0813a1a22d26
font_02_sfnt_off00016ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACE 12704 bytes
SHA-256: 5d5f545a5a8fad1b6859f0fe6a89635acaa4c79dbec0d6c801dcfdb9121ba624
font_03_sfnt_off00018dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD0 26620 bytes
SHA-256: 5a08df0ba4d6fd6aa474f40355a1181daec537cfa22c0bb0b4b64b0b8db67e54