Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdd27533ed96432…

MALICIOUS

PDF

81.5 KB Created: 2020-12-29 18:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 74f07ddbd41c3c4d9abf1aa84cd6bafe SHA-1: 226b2417a432f774518c0e705c1663282057ed81 SHA-256: acdd27533ed96432e8ec95a637e4892efbd6a127f5cd51f214cdebe16fba9fb3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying them as pointing to known malicious redirector infrastructure and a link farm on disposable hosting. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of malicious links strongly suggests an intent to redirect the user to a compromised or malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/strik?utm_term=drive+ahead+sports+mod+apk+2.+19.+0 In PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/8a68c5dc19.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/velububumudobikefeva.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/bewexit-budejumu-jusexerepag.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/1257411.pdfIn PDF document text
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/6f8d53d7.pdfIn PDF document text
    • https://kenivefu.weebly.com/uploads/1/3/4/7/134715486/eb955aa8fd.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/senejodib.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/SaCAkXd/audiotool_app_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc6ff1c-0fe9-4a93-8f4a-4f4c66b6c15f/travian_kingdoms_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3dfafb9-532b-4e50-927e-0f18a59a6618/intensity_dean_koontz_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0a0f9f-d7c7-4fee-8acc-9e3382b88260/what_does_vibing_a_person_means.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/27054389380.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/62940080202.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 5804 bytes
SHA-256: 2827cea4aa1e2c21f89edc5a0df2815777b14c850de917accb20a87bffff7500
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10048 bytes
SHA-256: 88f6d5bac0787f9220c0194d69f637571b9e0b79ba9f65e243d33fa6abfb0612
font_02_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 21896 bytes
SHA-256: 8ff0d1a20df9d92e935932b44c27f6561d23e13c36a1e4d2cadde2abde26e2fd

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