Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb49a464e93f16f…

MALICIOUS

PDF

89.6 KB Created: 2021-03-21 02:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b2f94454f04f072e4eb6401312d08032 SHA-1: 3cdc293f6d845c0b0378abc5a4faf025a3783fb1 SHA-256: 9bb49a464e93f16f7cfa346577429c010f53760d37d407ba46c5ace845271ee2
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to dafemum.ru. This indicates an attempt to lure the user to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/wix?keyword=directed+reading+for+content+mastery+section+1+electric+charge+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_600ecb56cbcc4.pdfIn PDF document text
    • https://zekubetude.weebly.com/uploads/1/3/0/7/130738740/5324015.pdfIn PDF document text
    • http://sportplays.ru/429261801916jswf.pdfIn PDF document text
    • https://fuxilidunud.weebly.com/uploads/1/3/5/3/135314653/7551211.pdfIn PDF document text
    • http://003-center.ru/adobe_photoshop_cs6_classroom_in_a_book_lesson_files_downloaddx1pt.pdfIn PDF document text
    • http://ygrash.website/ocean_fortune_apkd8uak.pdfIn PDF document text
    • https://gojamomajaso.weebly.com/uploads/1/3/4/6/134616238/sabaladonagixilori.pdfIn PDF document text
    • http://motuteb.22web.org/melovajumaxevugabadape.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/4687687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404502/normal_5fe5b3715c5de.pdfIn PDF document text
    • http://submonster.xyz/20738649916v28m8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fea2f24efbd0.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/veriwesag.pdfIn PDF document text
    • http://bisolivagamego.22web.org/39655593504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/9895154106.pdfIn PDF document text
    • http://xojixitutatafu.epizy.com/romeo_and_juliet_2013_full_movie_eng_sub.pdfIn PDF document text
    • http://rugizoxezixiw.epizy.com/dedijoduduxudisenan.pdfIn PDF document text
    • http://punegejofuj.epizy.com/believer_bgm_ringtone_zedge.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/2531631094.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/80828942471.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/windows_10_administrator_password_reset_disk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 5680 bytes
SHA-256: 4f49409f8d4f0168b033264af6421c6a424c46fa9bce9b1a7bf4d4b4c53a38bc
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10480 bytes
SHA-256: 7f23d88193e0683a44a6c043a54f90fd6547258be8d9f26c1cae4e92433af51d
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_03_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 9464 bytes
SHA-256: ccc78de567e197056f8eef07210cb6dcd6abf9bab0401b7b18c8cde636525a25