Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a88e1c141ccfd4…

MALICIOUS

PDF

76.2 KB Created: 2021-06-09 12:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4418d54551fed29759fdf79801056319 SHA-1: 75b18841c825f82e78734e726dff5cb5c6d153c1 SHA-256: 48a88e1c141ccfd46c5343e51bdf99569318455956dfaf1a2b2b0ec359c63c4c
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://wastran.ru/pbw?utm_term=the+last+airbender+full+movie+2
    • https://wumevevevusawu.weebly.com/uploads/1/3/4/3/134388399/46390.pdf
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/896511.pdf
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/d47ca914f00d.pdf
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fcf96d24a775.pdf
    • https://mogefitinovodug.weebly.com/uploads/1/3/0/9/130969954/fazekenezuze.pdf
    • https://cdn-cms.f-static.net/uploads/4414500/normal_604bb5b7a25f8.pdf
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/vekuxa_ribajokurupemog_xigige.pdf
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/wifotub-jimufujevesujex.pdf
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5fff9a4e452bc.pdf
    • https://junapeborizako.weebly.com/uploads/1/3/4/4/134443413/zakenowoloxukozixeg.pdf
    • https://viforiler.weebly.com/uploads/1/3/0/8/130874197/1977768.pdf
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/pevulepojodusozofiv.pdf
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff582deab6eb.pdf
    • https://xorukulimuz.weebly.com/uploads/1/3/4/7/134728044/8468830.pdf
    • https://wobifeda.weebly.com/uploads/1/3/1/0/131070490/funabokibemiso_kugadovipufu_nigadanax.pdf
    • https://cdn-cms.f-static.net/uploads/4455902/normal_5fd7f7e3a6e15.pdf
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fe977c4b393c.pdf
    • https://cdn-cms.f-static.net/uploads/4387419/normal_6048d46058698.pdf
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/pubewijesanenemodep.pdf
    • https://maxawoxemun.weebly.com/uploads/1/3/4/6/134615094/9955161.pdf
    • https://cdn-cms.f-static.net/uploads/4485579/normal_604ad64a26fa5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b698c4a-2be3-4bbf-b57c-61de1e6bbed2/jexerimibiva.pdf
    • https://uploads.strikinglycdn.com/files/54b460ff-d08a-48e6-824a-1d6b3349c3f8/98163176607.pdf
    • https://uploads.strikinglycdn.com/files/bab7cad4-7bb1-4a6e-93c1-2591b82785ce/sketch_for_mac_sierra.pdf
    • https://uploads.strikinglycdn.com/files/614c49c6-0737-45f2-ae6f-f661e0079732/sirius_xm_free_hack_android_phone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86d.bin
a29febd51cbe6c21a9ee32533a3a9381b64d1fde291a5116705a7ae87ba3e58f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 5428 bytes
font_01_sfnt_off0000fabc.bin
c68808ca21b8699a53f9b7b6ca1573bbf1036d475886539a8e800e1b97f5ea0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 12116 bytes