Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ffc524e416c8b9…

MALICIOUS

PDF

69.4 KB Created: 2021-03-28 10:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ee75d391543489907edb153a40236e53 SHA-1: 684d930adedfc3a7d04c001571f05801f8b5912b SHA-256: d9ffc524e416c8b9fc6f8c95b4deace3b2044f47b53d559507d90d054667ddab
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' further indicate malicious intent. While no scripts were directly extracted, the PDF structure and external links are indicative of an attempt to redirect users to malicious content or initiate downloads, likely involving exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/123?utm_term=tere+te+marda+munda+ambarsariya+ringtone PDF link annotation
    • http://fuxanujibiz.mygamesonline.org/97938278302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5ff518ddca574.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/pubiwowivujebekopote.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/65888782955.pdfIn PDF document text
    • http://dinusedixiwog.iblogger.org/docker_community_windows.pdfIn PDF document text
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/4841800.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/e78578c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_603a23cf362ad.pdfIn PDF document text
    • https://veselamo.weebly.com/uploads/1/3/1/4/131452803/8281029.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/1a0f3acc1ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_6030e92a44e2d.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/lagavirerirera.pdfIn PDF document text
    • http://zexezolevonim.iblogger.org/bandung_conference.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/41975938448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_5ffc93dc799c0.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/1678902.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/mopasigudefiroroketi.pdfIn PDF document text
    • https://mokoxobijukox.weebly.com/uploads/1/3/4/3/134321678/9e2b6.pdfIn PDF document text
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/wematamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumezasaguruwu.epizy.com/femefifuwel.pdfIn PDF document text
    • http://zagebixomibolo.rf.gd/which_beans_have_the_most_protein_and_least_carbs.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/h._s._c_result_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/81966086677.pdfIn PDF document text
    • http://nununad.myartsonline.com/stock_market_trading_hours_day_after_thanksgiving.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 5304 bytes
SHA-256: 3f0c4804565ae243d957b74aaa8966ff58d1c1f3fc7891bcb9f4959e0a7bcd5c
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 10932 bytes
SHA-256: 49391b827dd0728786bb2f422ecb91c8d9be1cc9b79a5c4dc96d85ed99440839