Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a49fca62a9a0fa…

MALICIOUS

PDF

85.2 KB Created: 2021-02-03 01:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eeb7ab26590d3d9c298327a10588e767 SHA-1: 0edb677e81a9637923c7e4a50df2890260a5848a SHA-256: d7a49fca62a9a0fa17ed49eccf25c19d37ca92a15265fc5c0e7d42b494aa1d0f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm designed to obscure malicious redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL 'https://yafferge.ru/123?utm_term=grossmont+high+school+class+schedule' as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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.
  • 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://yafferge.ru/123?utm_term=grossmont+high+school+class+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_600b0f68d4dda.pdfIn PDF document text
    • http://zenarajare.22web.org/nefixojug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5fcbfbcb598fa.pdfIn PDF document text
    • http://all-system7.xyz/mathematical_ideas_13th_edition_downloadjle2p.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/DBhjhh0/best_target_archery_arrows.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/3693a979b6.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/ggVgihe/51511924550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5fdf1bc4a7a18.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/tikadojejifafob.pdfIn PDF document text
    • https://delidanazej.weebly.com/uploads/1/3/2/6/132681463/9b575d1d66.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/534311.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/Jggghjb/92843654393.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/fejififimaketo/beneath_your_beautiful_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/transformari_metri_cubi_in_litri.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/endocrine_society_hyperprolactinemia_clinical_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/al_khwarizmi_books.pdfIn PDF document text
    • http://pofiwun.rf.gd/34743043380.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/naxosafemekepuvo.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_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 5268 bytes
SHA-256: 57893f3442440073e8e3ad7b82115daada3ddd7c8bb14652aed1ef5b6fc4e55a
font_01_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 10356 bytes
SHA-256: c92cb261dd1407a720fe95f4732af52cc8f231af9eb2fc4ef13c31991eaa1b84
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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