Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd57784dd68c95cc…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 09:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c3444ab38efbbd93deb039a5b9276344 SHA-1: 185a8b8903ed78c381f1674eeeeed1e1c2ed8d34 SHA-256: cd57784dd68c95cc0170e23ab2eb57bdcb3e9913fd125f5b054c742488d2a48f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/wix?keyword=mimi+nails+hours PDF link annotation
    • https://cdn.sqhk.co/rarirawibowo/Cjgijhd/zabexuralenase.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/q6lhcIn/11019999404.pdfIn PDF document text
    • http://dobanojuwelog.22web.org/el_hombre_mas_rico_de_babilonia_gratis_audiolibro.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/P5gigil/babu_baruah_assamese_new_song.pdfIn PDF document text
    • http://zufutefej.22web.org/56956990106.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/hcghifn/98084665494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexupanuwobazab.rf.gd/rosamejiwowigibuvisim.pdfIn PDF document text
    • http://ruroratetibik.rf.gd/sasanoruzexikede.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_c4fcdc5e4ca042a6a8faec66ab04f542.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/busqueda_de_informacion_en_internet_importancia.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/fikikamogazobatalidu.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_bded7829fb654301b209411a33b19551.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_c028aaca42fc4102b8e725e27edde300.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_f8d9c2670e6d4734be35869233338cbc.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_39b05453e10e4d99b4aa35b917a892bf.pdf?index=trueIn PDF document text
    • http://fijetetesozaw.epizy.com/90091310264.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/a_level_physics_practical_notes.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_7ef5fe56888940229e10af423b022f37.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_4e92ec7f782b43d7b978e2e883804cc7.pdf?index=trueIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_ceb3300c6cb0418da38ebbe35ddc78ea.pdf?index=trueIn 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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 4932 bytes
SHA-256: 767a3f77cb7349586ca0be132aafc1b04426a292f423c9ac9725be14ebaf5dc8
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5108 bytes
SHA-256: 3a09f98c8bd3efc9f0dfd7b247240f89f83c7f00226387b9d7847b8dc703d0a7
font_02_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10792 bytes
SHA-256: c4600bad40dcabea54acdae8eb74a8529286eb54d7b3520f72e82e7fd1bb0ac6
font_03_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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