Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda217160eb32011…

MALICIOUS

PDF

72.9 KB Created: 2021-02-15 10:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c927adf62e3255db33fb724cb0afe23 SHA-1: 976ff8196d798576710edc9e801645557de5f036 SHA-256: bda217160eb320115ca9ce3f96468e079d6d8ebf5f10a720ad765fc4c9f7a05a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain 'druttle.ru' that is likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obfuscate the true destination or track user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=hunter+douglas+remote+control+blinds+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5fd79b959cdff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_60028cf22dfd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_601b38733ebf8.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/jcx9lse/zugavanakijazifasofedema.pdfIn PDF document text
    • http://boxidodo.22web.org/zakenokanalikugeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_5fdcc6a75cf1e.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/cFFbjaV/chest_simulator_workout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_601634ed99ec2.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/hjBGSja/class_appropriate_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/f3xhhjj/hidden_picture_riddles_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_5fe6b0e484a6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepipejesa.epizy.com/jizanelovunizunuvisi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/mobogenie_1030_apk_free.pdfIn PDF document text
    • http://dojovosis.rf.gd/adobe_lightroom_tutorials_free.pdfIn PDF document text
    • http://gesulobanaxa.rf.gd/business_partnership_models.pdfIn PDF document text
    • http://wafugid.epizy.com/kan_ik_netflix_en_op_macbook.pdfIn PDF document text
    • http://sixosotonipo.epizy.com/gujukekevofera.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5360 bytes
SHA-256: b3e53110bfa0965c1421f9ff466c614a77e6b9c57009c25519dbd68428e7d65e
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 11192 bytes
SHA-256: 5dd473286d86c19e9e137383f4751a2ec10f69d7fcab7a5f7dbb53619808ae8b

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