Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5775060ca9b5c1…

MALICIOUS

PDF

74.3 KB Created: 2021-02-15 01:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bda442fa8dfb3caa24d4550b50f7ef1f SHA-1: df8f345c62cd8fba1952d5bb76256c0d2d3a9e1f SHA-256: 2a5775060ca9b5c1d90001dffe5cd62c92fafab64ca128f7dea7d807f9bdf2e6
184 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 URLs pointing to disposable domains and link farms, identified by heuristics as a malicious redirector and link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'limiting reagent sample problems', likely to trick users into clicking the malicious links.

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 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://yafferge.ru/aws?utm_term=limiting+reagent+sample+problems+with+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5ff96fd51df9f.pdfIn PDF document text
    • http://youla-24.cc/meribunuxanofarorerib3bb1.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/svge3jh/visit_florida_beaches_map.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/jh6jgha/64024757766.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/3higeur/heroes_3_horn_of_the_abyss_factory_download.pdfIn PDF document text
    • http://avit0.cc/i_survived_the_shark_attacks_of_1916_picturescu3za.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_5ff305fe1ff4e.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/7hfsVjg/free_vpn_for_pubg_mobile_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fc868f43aca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fe6beb8115bd.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/jigg2hd/xibilisuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fe5543ad71d4.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/cGqieI3/smart_balance_peanut_butter_chunky.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/woBhjji/62089220699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fc72a6730d87.pdfIn PDF document text
    • http://harkateine.fun/rerimulodeluvegokofawelqe482.pdfIn PDF document text
    • http://daddytestit.xyz/53872496436usfwt.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/JxidhgO/hello_blocks_wooden_block_puzzle.pdfIn PDF document text
    • http://balifruit.com/writing_task_2_ielts_sample_answersui5qt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 5408 bytes
SHA-256: e2a74e848a39798da04251c62aabeab12f324ccca435ac0dfb2c08f20b46d15f
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10856 bytes
SHA-256: 2abcc3569763ff3eecdc2a610212ea71b0ef21a8a7fa97cd7f520643080a9017

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