Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c978c50f6bf3152…

MALICIOUS

PDF

70.1 KB Created: 2021-03-20 00:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fcde465c3c347b3e8aec02b72dc93848 SHA-1: eb92b7e4d372718b681bdef3c4dd096dfb7df312 SHA-256: 5c978c50f6bf3152c4ea22dd1287404cf3db75986c9715caced58a737b83561d
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing embedded links, identified as malicious by multiple heuristics including a redirector link and ML classification. The document body, though heavily obfuscated, suggests a lure related to a 'Sony handycam manual'. The presence of numerous external PDF links, some pointing to potentially benign S3 buckets and others to unknown or malicious domains, indicates a link farm or phishing attempt. The primary malicious IOC is the redirector URL which likely leads to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/wix?keyword=sony+handycam+video+8+ccd-tr330e+pal+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_60491b1202cd3.pdfIn PDF document text
    • http://tobubolixej.iblogger.org/31899576242.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/14537046705.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/4380326.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/honeywell_rth9585wf1004_instructions.pdfIn PDF document text
    • https://gopiwalugase.weebly.com/uploads/1/3/0/7/130738825/8411cadaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368251/normal_5ffd7c3d0f8c9.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/vemenolunureg.pdfIn PDF document text
    • http://korirojasutito.22web.org/19604202610.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/4689149.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/tumasun/bafonavinez.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/mifevut.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/ceo_up.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/fovakoronuxogidopasolagun.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/xofunotavatazofimag.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/79103855660.pdfIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/learn_english_grammar_step_by_step_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/24726546.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/agenda_format_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/interview_questions_and_answers_for_retail_merchandiser.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/get_video_views_on_instagram_apk_free.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_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 5932 bytes
SHA-256: 50dac8421f31d5639ca79bd14cc75ccdf1233a5b19fed140b200cee53517f102
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 11528 bytes
SHA-256: 2a387d607d0c5109a39fea0a531f0cd9e97cf3f6a9a3ac07393f543e599abb8e

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