Malicious PDF — malware analysis report

Static analysis result for SHA-256 d669d96c3a8093ae…

MALICIOUS

PDF

81.0 KB Created: 2021-02-14 08:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7dcc83724b79a9909ed09d616ac35161 SHA-1: b48644936a4470e754f04f5d818af240cd193a5c SHA-256: d669d96c3a8093aecb533be84a1813b90338410c0e7e07943e3406d0ba01ad14
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs pointing to disposable hosting and appears to be part of a link farm, suggesting SEO manipulation or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/wix?keyword=cpm+precalculus+answers+chapter+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388611/normal_60109ae537ac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5ffb0895ab64b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_600f49ca6ebff.pdfIn PDF document text
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/9750068.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/6a871acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_601b9266aeb84.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/sevun.pdfIn PDF document text
    • http://dovoxijego.iblogger.org/idsa_guidelines_catheter_associated_uti.pdfIn PDF document text
    • http://gepudowajafulo.iblogger.org/rejasuzaxiguxenez.pdfIn PDF document text
    • https://xopusetimova.weebly.com/uploads/1/3/4/1/134108877/rimulunepup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5fe0b7e7db328.pdfIn PDF document text
    • http://fogatevemawe.22web.org/ac_market_free_apk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_6009cc25dd4a3.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/fagilipoboseba_numubuvopabibot.pdfIn PDF document text
    • http://centre-blannaves.frIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kukadafimi.rf.gd/wilefubadokiwo.pdfIn PDF document text
    • http://xegiseko.epizy.com/entry_level_accountant_resume.pdfIn PDF document text
    • http://mobevawawe.rf.gd/13899634898.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5248 bytes
SHA-256: e89fed59616f3d45149740a9ba2f5df45628a845d02152055469d91e2d8b05ec
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 13836 bytes
SHA-256: 11ad3846213a78b0d8d44cffa2c0ee029dadfd43357e9308a732554c871c4c33
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 16152 bytes
SHA-256: 8d085fb61775106f352b3c754f3ce3e5beb5ea8ed247c33b6c59a26f7370a4f6

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