Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e18a78d119fefd3…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 15:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 732b36949e26f7855ccb4690dd9b41c0 SHA-1: 3074d12e311451e44dedacef590207b60a277804 SHA-256: 3e18a78d119fefd32495abf857673dbade9387a4b9f436230be8a6a0c4e5bea6
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. One of the primary URLs extracted is https://fokemale.ru/award?keyword=memory+angielski+dla+dzieci+pdf, which appears to be a lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/award?keyword=memory+angielski+dla+dzieci+pdf PDF link annotation
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/63ecf0b7.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/broken_vessels_chord_chart.pdfIn PDF document text
    • https://xonugovelixef.weebly.com/uploads/1/3/0/7/130739086/2440832.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/writing_a_research_proposal_psychology.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/download_aadhar_card_format.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/ciiiI8B/assassin_s_creed_liberation_ps_vita.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/lolulubize.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/inKxjhP/8697079554.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/socrates_philosophy_download.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/winuzasijixoxagamek.pdfIn PDF document text
    • https://wakepazatojux.weebly.com/uploads/1/3/0/8/130873951/7580090.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/budgeting_in_nigeria.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/89165318991.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/58099608830.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/rexan.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/kiwofutajesotuwa.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/firopow.pdfIn PDF document text
    • http://wativeb.mypressonline.com/jokazuleliv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazobelo.onlinewebshop.net/54889369138.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/47558959192.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_83b2d19a97e64a6181b98da01b634ab8.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_5cb4d37284114841841cd08d5f573e87.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_39a6d1836d5e495c9c6221f4f2a1d074.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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 5696 bytes
SHA-256: 4466bb1ae7e9f64014b51d6161723d541c98975feb69fce0080e6887e2674b8a
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 12388 bytes
SHA-256: db7affef09b14b2756ce513d0811dd01d88af5cb22af99cf9edf7a39f71748cd