Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b61000a7adc1558…

MALICIOUS

PDF

77.9 KB Created: 2021-04-23 15:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5416855e7b10213993938cf0f53bb7d5 SHA-1: 53cb3dca3af6fbc1c4569d6c50c379204c24d970 SHA-256: 9b61000a7adc1558ab797e2e22f7185fa842b4ac6203e832b0f1e40a10092d5c
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=how+to+reset+my+samsung+freezer+temperature PDF link annotation
    • http://memowelubi.mygamesonline.org/gopinujisabozese.pdfIn PDF document text
    • https://maviwodoke.weebly.com/uploads/1/3/1/6/131606431/4130701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5ff3227ba663a.pdfIn PDF document text
    • http://luminar4-download.xyz/nafigofomikpsf8s.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/fudaxamabijugo_somedelug_rinusov_repag.pdfIn PDF document text
    • https://ropupapufodugut.weebly.com/uploads/1/3/4/6/134650221/ddfae46e0ae5.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/gotup-gusiturezema.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/moroviwipozo.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/xojisagegeju_paketelulal_lizide_fikisava.pdfIn PDF document text
    • https://lisebilapuwuw.weebly.com/uploads/1/3/4/0/134096741/najipananimamabor.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/jelarazoxepuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_606c079d27414.pdfIn PDF document text
    • http://natikolom.site/jersey_mikes_california_dreamin_ingredients91ihy.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/acute_abdominal_pain_differential_diagnosis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_6028fd137e9dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fec9b02a9db3.pdfIn PDF document text
    • https://fofezuse.weebly.com/uploads/1/3/0/7/130739341/4eed4f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_602bdbeb29950.pdfIn PDF document text
    • http://gooddevice-online.com/49094165282hiqy.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/gefejipu.pdfIn PDF document text
    • http://hookup668.site/71624569025sftbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_576fc0a670c74ce3a76799490661446f.pdf?index=trueIn PDF document text
    • http://nabulegewuwal.myartsonline.com/92152177517.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_c593e67513cb4a0198a9bf917c164942.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_8f6c7cda09694ab680595e27d7519b2b.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_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 5396 bytes
SHA-256: 411af87b181a23fc78c570cd779cb66e8c491b0676ccb22a7ec255f01ad7b262
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 10400 bytes
SHA-256: 6ab670efdf58542586c65dccf5ab466552bfd98c67ef9bc4e91861d60a6d5e29