Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4d637bd1479e82…

MALICIOUS

PDF

72.1 KB Created: 2020-12-02 08:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b93bf78c70c8304a93b04d37ae1542ce SHA-1: b3f8f604b0dc3df8b69deba0116aef06505e4d79 SHA-256: 3f4d637bd1479e826ccb618671c77e202b1979f77a08edb596905ee7beb84af5
156 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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=toddler+observation+form PDF link annotation
    • https://mupaxezofede.weebly.com/uploads/1/3/4/3/134317166/7684114.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/c3d7f91fcb.pdfIn PDF document text
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/8622526.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/4984441.pdfIn PDF document text
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/zifow-galemuponik-robijubonaj.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/sixudibajoxasiw.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/e5bd0c3789b.pdfIn PDF document text
    • https://vavuxajibibugu.weebly.com/uploads/1/3/4/4/134472661/nilubesavifesoke.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/fijedilizaju-kifemukeziv-nuxunelu-mababa.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/xemovipalaz.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://static1.squarespace.com/static/5fc0ea21e2fce462bc8c0024/t/5fc1d7273f75b1664317a45b/1606539054944/enthalpy_changes_calculations.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0df209955c744b53b696b/t/5fc1349f6457125654676565/1606497440232/nc_notary_public_manual_2016.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd1e0c89e1c4b8fb81223/t/5fc583b3145a8629dc6df31d/1606779827326/mufemevikigazapakagex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e7ad6609fd0ee79153f2/t/5fc360547acac6192a2b91a2/1606639700389/no_son_of_mine_lyrics_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bebbcd1e280355d37542/t/5fc359c5f8cdb769c64e0433/1606638022410/12909511877.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5112e12facd59cec7c30d/t/5fc52feee6d49a06bb3a8489/1606758384993/pelolazesas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 4988 bytes
SHA-256: 839935c44a4cda9953a2368eadd55ba0750d48fdf485f350b7134644ce5fb85c
font_01_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 9712 bytes
SHA-256: 95831e5eeb168cfe9df098d6cc73e82957af2223d7fb5ee0015385b5d225e072
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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