Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dc520cdb9e9159…

MALICIOUS

PDF

80.4 KB Created: 2021-01-21 03:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9f95b353705c6d80f3ff2b3e25c98d3 SHA-1: 9cdcf8f156593e9c684d916bd71fb1eb0db71335 SHA-256: 52dc520cdb9e91592cd417ec37711c95aeacbdcd86a81fe63284a917034360e9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate content related to home security reviews. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to potentially harmful websites.

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 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.
  • 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/aws?utm_term=best+home+security+system+reviews+consumer+reports PDF link annotation
    • https://site-1255234.mozfiles.com/files/1255234/anyway_synonym_form.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/8355472.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/vowariribak-lesenoxuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5fab8f16b60ec.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/xebuf_derovu_sodijelesavupob.pdfIn PDF document text
    • https://site-1252766.mozfiles.com/files/1252766/maralefisiketit.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/wisedumezimeru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dedetepejoxele.epizy.com/home_design_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/90911833143.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/34091603862.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/fivamuzisujupakonijusavof.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/akuh_online_laboratory_reports_portal.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/beneficial_arthropods_and_microorganism.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/super_mario_maker_2_costume_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/11881625454.pdfIn PDF document text
    • http://vadibezodaxilez.rf.gd/rolugumejizuvibib.pdfIn PDF document text
    • http://wuriwafu.epizy.com/stoichiometry_mole_to_mole_problems_answer_key.pdfIn PDF document text
    • http://fasilew.epizy.com/digital_platform_economy.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/chuchu_tv_free_for_pc.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_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 5232 bytes
SHA-256: d7592a185406b01bb8f15608055c0621ea3d5574d7d7b39c1c274f0099c11c96
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10276 bytes
SHA-256: b0296d44dd272c41058f983d7adc70f577f6a437689631d6de31da6001e51e31

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