Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fa765751eaa5dc…

MALICIOUS

PDF

142.2 KB Created: 2021-02-19 04:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ab40687cb52add95047b6c2f2f29daf5 SHA-1: 70c86fb01a4273d45a92206d99b8e0076957c449 SHA-256: 54fa765751eaa5dc690a16a6f8fe5a0547de986f483a6a9c5112575ba8b946ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://leonvi.ru/123?utm_term=what+is+the+order+of+the+prophets+in+islam PDF link annotation
    • http://afracheat6.xyz/necromancer_names_diabloobd58.pdfIn PDF document text
    • https://xenesadu.weebly.com/uploads/1/3/0/7/130739949/49786e6a23d.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/wefezowatorapen.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/kajiketijokenus.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/gikiwewof.pdfIn PDF document text
    • http://xokodiraki.22web.org/33134506561.pdfIn PDF document text
    • http://nesobaka9.xyz/45644353369lgo7f.pdfIn PDF document text
    • http://idealica-official-it.website/esma_remuneration_guidelines_aifmday98m.pdfIn PDF document text
    • http://islta.fun/77291702897p312a.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/5839000.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/kamonaraweko-dipomusafurono-teluvupada-zatuxote.pdfIn PDF document text
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/7011086.pdfIn PDF document text
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/2333844.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/xewibosonobogop-wosodomekolavu-lupenomudop-vuvodol.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/parafijige.pdfIn PDF document text
    • http://kernig.online/yummy_tummy_guide_amanda_finnie85pis.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
    • http://kafudunafow.epizy.com/autodesk_student_navisworks.pdfIn PDF document text
    • http://fadajoja.epizy.com/padman_full_movie_skymovies.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A48A 2940 bytes
SHA-256: 7cf04fa84166d1ff7de18644cffd0578a6e49d2502dba17a344fda77088a0a38
font_01_sfnt_off0001af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF17 5080 bytes
SHA-256: eb2d176af268faaa78fb87edeb75b4dec2026d33d532be9fabb9d83fb6d18e67
font_02_sfnt_off0001c037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C037 18424 bytes
SHA-256: 488f644078d70e7b36dff123d29beea2cce61367f99dfafd443b43f04870e31c
font_03_sfnt_off0001f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6D6 21648 bytes
SHA-256: 614907fb70673c14213e1552a56d603bab43e45e0fb1a7d3c8f301e620cc4fd8
font_04_sfnt_off00021c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C55 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361