Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1895e721bf5db37…

MALICIOUS

PDF

73.9 KB Created: 2021-02-16 00:30:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c23e61b02048756c3f06f20c479c44c8 SHA-1: 29cac4a2d0e6a0644575a92017af8b29fdad8418 SHA-256: b1895e721bf5db374da1243dbe70da7f30e0a9e8e94be6b1f8cb73f6595cc3de
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being 'https://baarspo.ru/123?utm_term=how+to+write+a+decimal+in+hundredths'. This suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=how+to+write+a+decimal+in+hundredths PDF link annotation
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/ae1f6698b6ad18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453326/normal_6001aa27ced3c.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/3005003.pdfIn PDF document text
    • http://myirn.icu/leatherman_rebar_sheaths6s5l.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/jedefawezudew_runiwusoliv_xoxebajut_madedir.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/vaduzeziwajutiberax.pdfIn PDF document text
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/7288796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_600ff51dc5fe1.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/pojufoporela-dadulem-nekinopagosotew.pdfIn PDF document text
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/9857560.pdfIn PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/235225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lonozote/chrisette_michele_epiphany_album_zip.pdfIn PDF document text
    • http://figabubif.rf.gd/vsco_full_pack_mod_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/edhelper_word_search_answer_key_1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 5232 bytes
SHA-256: 8245a3144169498120a98f47e5abc1eee69ed3e694c80fd1a4d01ff6d584dd57
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10800 bytes
SHA-256: 2dd8fe48e9a91534b8c621b16d416bb09c3443a51065efdd0f96e25ea1e3853c

Open this report in the interactive analyzer, or submit your own file for analysis.