Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a71098501dee738…

MALICIOUS

PDF

82.5 KB Created: 2021-03-07 22:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fbf1ad3247408247c4d3349e66ac3fc9 SHA-1: e8da4c986a7f7d4a4a0c8ccde8b01f6c791065ef SHA-256: 5a71098501dee7380d5a2b3e65f89d257298b585433ef1fae07a522f73aa2adb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, which are likely intended to redirect users to phishing or malware sites. The document body, though partially corrupted, suggests a lure related to car sales, likely to entice clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=toyota+camry+2015+for+sale+in+ghana PDF link annotation
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/62324031e771.pdfIn PDF document text
    • http://creditstar-kabinet.com/noxulugmtsai.pdfIn PDF document text
    • https://xorurilij.weebly.com/uploads/1/3/5/3/135325910/7924471dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_600f414e5191e.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/futuremaxafivovun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_60146d9daebdc.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/nalapidinej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_603f887478f14.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/2837ce24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368970/normal_5fc5f29c2dc92.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/kujemulubiwa_tukorix_mukevopumoz_xotirefezawe.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/tizogojapasoxokazaj.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/6237394.pdfIn PDF document text
    • http://lightly.store/cricket_information_in_marathidfjej.pdfIn PDF document text
    • http://maturibcgj.space/can_a_psychopath_be_a_good_friendw47wf.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/nufowiwusop_nitorikarur.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/fowavewipuf.pdfIn PDF document text
    • http://weraka.online/37324487614anqbr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_d4fbf6d4c5ae4048998d0e20be1f19f5.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_252c4e2de3f94e14a4395234113721f7.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_d34c911b241a4818adc26bc4dd58ac5c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 5584 bytes
SHA-256: 76022ccd9a6ab477e376dcef917d82086a8652399cb5f49f1b15f33b3c205f39
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10476 bytes
SHA-256: aa90e85f35c53145b8105d25518df05742b7c7d3b8b4af13ae5c2cfa3c7410af
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2