Malicious PDF — malware analysis report

Static analysis result for SHA-256 1312269eb019eaa8…

MALICIOUS

PDF

72.3 KB Created: 2021-03-16 23:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7ffae58976409830863a1ea41d3cb37a SHA-1: c2c53c8be01e23a9c95216e6c513389457ff8e0d SHA-256: 1312269eb019eaa8bd50124d10494eaa6f78e6a39e7e25d42d146b5e70bd62d6
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' lure suggests a phishing or social engineering attempt to trick the user into navigating to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://crophysi.ru/123?utm_term=icloud+photo+stream+to+pc In PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/a386963596a6.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/juluxuxut.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/2513585.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/how_to_turn_the_ringer_off_on_a_vtech_cordless_phonel9lvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_60285d3b21c2c.pdfIn PDF document text
    • http://gamuvew.iblogger.org/sig_p226_mk25_ca_compliant.pdfIn PDF document text
    • http://nufefabipiketod.22web.org/73218725244.pdfIn PDF document text
    • http://future-techno.ru/898350109384710w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_603b3728ee7e3.pdfIn PDF document text
    • https://sofepusususe.weebly.com/uploads/1/3/1/6/131636682/296243.pdfIn PDF document text
    • http://fufirajonitav.22web.org/21285566258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/33331870365.pdfIn PDF document text
    • http://vuzudaru.epizy.com/what_is_the_big_little_lies_theme_song.pdfIn PDF document text
    • http://golofupatawef.epizy.com/zasugod.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/19860317754.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/wuwusazugijidefakeloj.pdfIn PDF document text
    • http://perinuve.epizy.com/xijakuwikumexitugimusexer.pdfIn PDF document text
    • http://sikofus.epizy.com/99664772516.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/23953748829.pdfIn PDF document text
    • http://kobezitidub.rf.gd/wasted_paris_size_guide.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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 5248 bytes
SHA-256: 10c5f5b2e06e668af80da570deb9a3a77b820ee982ccb9476f6393b6deddf961
font_01_sfnt_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 10496 bytes
SHA-256: dd57f22c39cace0caec70567de53e48b33ca3e6f4083e6abb1488d25cbdb69e3

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