Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a9cf416a73c0a5…

MALICIOUS

PDF

86.7 KB Created: 2020-12-31 04:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b62476ad256e9d826fe613164878ae48 SHA-1: bb56938184f7fc60b0c12557b996b08839af9ebb SHA-256: 89a9cf416a73c0a587fd7f208d39e5286a4ee3ffb8ae6cbc369b9cc755d67522
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cctraff.ru/strik?utm_term=battery+tender+plus+manual In PDF document text
    • https://bufasadapigeze.weebly.com/uploads/1/3/4/3/134307931/fulokulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fde3b2184eeb.pdfIn PDF document text
    • https://lemisisax.weebly.com/uploads/1/3/4/4/134494561/3b02a4b988e.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/kuxitozegivumeliw.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/peselovo-mevevopomidig-xurilewizato-xakitekiwofipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f88f791bd303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/sleeping_freshmen_never_lie_plot_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/89592047792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c75ddb-f429-4972-99ea-84ea7ef9731e/28359681355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf9527c-efa1-4046-b370-cf6a1276e957/21968616317.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/predicate_pronoun_list.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/53317905213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e77a123-5188-4010-9d47-ff1dc65ab4aa/rewexomupozaruwapi.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/present_tense_translation_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/xovasuwaregapuzow.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/76829661627.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 4980 bytes
SHA-256: f1840a15405615b1979126f6ef7e01f09b9b1c50a4399a19c5ee6bc031818968
font_01_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 11972 bytes
SHA-256: 1d7c69620d6394558acdccc1d7bc9731a381a7b68a65c85c6ec63c21b6b92def
font_02_sfnt_off00013fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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