Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaaa46e3f7a29a4…

MALICIOUS

PDF

78.2 KB Created: 2021-06-06 05:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b97592e70a02fcc7ca66c25dcb2ac784 SHA-1: e1a8501907071b6a0e6dfcdad9cadd94de1deae7 SHA-256: ddaaa46e3f7a29a47ec52d67514b78f97250e59214686baa56e2869c0a823b59
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating phishing and trojan characteristics. It contains numerous links to disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The embedded URL `https://synerhu.ru/pbw?utm_term=free+download+song+achyutam+keshavam+krishna+damodaram` is presented as a lure for a free download, which is a common social engineering tactic.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://synerhu.ru/pbw?utm_term=free+download+song+achyutam+keshavam+krishna+damodaram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386834/normal_604de1e9b58bd.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/finekodome.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/7867407.pdfIn PDF document text
    • https://wisezoverok.weebly.com/uploads/1/3/4/7/134707123/panafuzelisise.pdfIn PDF document text
    • https://tepimetasufiro.weebly.com/uploads/1/3/4/0/134012902/f2f5cfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_6008df24780da.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4459784/normal_60b04237eebb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_604a46e8e4b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_6011c5ad8bb41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_602c350b2a959.pdfIn PDF document text
    • https://xivixomepovi.weebly.com/uploads/1/3/4/5/134518427/4345724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ff1e65c7673d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_601122ee4128b.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
    • http://vawijoj.pbworks.com/w/file/fetch/144634689/how_do_i_legally_evict_someone.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/samibalex.pdfIn PDF document text
    • http://rilewikem.pbworks.com/f/gta_san_andreas_apk_indir_cepde.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/nepesabugozinaguw.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/liginiwaxufetamejapoge.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144525936/xefudat.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/w/file/fetch/144673407/how_to_install_a_pool_table_felt.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_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 5508 bytes
SHA-256: 5f3b50e184be00d58fac390d0d308b61c771807a3e6e18fa900df32eb869059f
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 10460 bytes
SHA-256: aa0e14b0085f08ce67d912e663fc8b4f45a67923615db948b180a85b8e4d2427
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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