Malicious PDF — malware analysis report

Static analysis result for SHA-256 e567e14d4c035ee0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-03 05:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac9c8230b7ee0e3d2f98f6c69ae3b307 SHA-1: d7c630921cf0e52f74bc135745353b39c33ba9fc SHA-256: e567e14d4c035ee0aa35b9475683a3b3ec6a63d794be7cd84d5d4d90239ecf7c
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 0.9956

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://jumiwimov.ru/wix?keyword=minecraft+13.0+1+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411926/normal_5fcdab0f6033f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_603aad0922b3e.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/2jgagia/1507627185.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/reset_ink_pad_epson_l5190.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/7092635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_5fe98f6e87c70.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/temepivepojo_domuwugupegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_6065aff58426c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_600ea51f4d8e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_60480fdd5c57d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fcea398e7eed.pdfIn PDF document text
    • http://bobezib.22web.org/zomoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_6035817a5d201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_601d3a287b6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_601b88db821b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_60591f15d239c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600fc33f6ebda.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_605b8cc58c3e8.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/30dbf181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fcb4942d7afe.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/vijolo.pdfIn PDF document text
    • https://cdn.sqhk.co/tumufiwusifo/Bhigjjd/fugizexorunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugikefabepumuk.epizy.com/xisasexodel.pdfIn PDF document text
    • http://ritebononopa.epizy.com/juzotisaverujekona.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/select_date_format_mysql_php.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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5520 bytes
SHA-256: 165b934e82083aeaa197610aa1c407a38ce567208319906b1b47abaa79820cc0
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10220 bytes
SHA-256: 1dfef214dd658a971d829b5d9b45df5520d7f506f526e7f81c327ae7781468f0