Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4db7c8769becfa…

MALICIOUS

PDF

88.1 KB Created: 2021-05-26 15:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 78ff56a9b95a8d07ce00747599d3a07f SHA-1: 0c9d7390b43a4743de394b9561001527c53e6852 SHA-256: 5c4db7c8769becfa710f3caf54b59e79e249998c3f1e8f4195824065fe69078a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO spamming operation. The presence of a URL with a 'download' query parameter and the ClamAV detection as 'Pdf.Phishing.Trojan' suggest a phishing or malicious content distribution intent. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=kick+2+ravi+teja+full+movie+hindi+dubbed+download PDF link annotation
    • https://mafekesajivirik.weebly.com/uploads/1/3/4/3/134381466/pufesojovudip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_60203ddd96709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_60175a60d0d7c.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/53015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ffc4d7fa0d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_6011350f1d843.pdfIn PDF document text
    • https://misodewegakev.weebly.com/uploads/1/3/4/7/134717908/a292289cd3f48cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458163/normal_5fcd256caaab9.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/buwisavivojimov_pobovenixorimon_muxebutanapof_jokanowoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fd15f0a69bc0.pdfIn PDF document text
    • https://foxegakadop.weebly.com/uploads/1/3/4/3/134337736/94aeae.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/1782956cf2ddb8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_603082163e564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_6027876408680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_60186d8d2f210.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://uploads.strikinglycdn.com/files/4d1efc4b-d990-4f87-aa0f-0ddc678da265/97249545126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f6b1b6-c37a-4002-897f-95795a72b494/fikabodovijikelomudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db7c585-a558-42ee-9af7-c94c3f9b9eb9/vobajazivaxovizedemabowej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cf1ace-5624-4b59-8d9f-e82388cf1649/vajulonef.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012aac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12AAC 17396 bytes
SHA-256: 0b295ba304a3a37428caf006821a01afcdc5e608f52850cdfe34a5fd204a4199
font_00_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 5496 bytes
SHA-256: 454901f97e401ac462e0f39658537c9e1145f6b356d580ccc752a681b5c4449e
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 11828 bytes
SHA-256: 741a9f8acbcb3881f54f2dc1325790b551b3e8b32d84de2851644517f015b486
font_03_sfnt_off00014459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14459 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e